Is Goblins free for teachers?

Yes. Goblins offers a generous free tier that includes 1 live feedback assignment per week, insights on student mastery and replays, and the ability to upload your own content. The Max plan adds unlimited assignments, superadaptive mode, grade exports, standards growth reports, and SSO/LMS integration, with per-student pricing for schools and districts.

How does Goblins work?

Three simple steps: (1) Share an assignment from thousands of standards-aligned topics using a share code. (2) Students speak and draw their thinking naturally, and Goblins responds with Socratic questioning that sounds just like their teacher. (3) Teachers get real-time formative insights showing what students struggle with and suggestions to inform instruction.

Does Goblins prevent cheating?

Yes. Goblins uses a purpose-trained AI model that evaluates cheating signals in real time. It can detect when students are copying answers, using external tools inappropriately, or not genuinely working through problems. Copy-pasting answers is also blocked.

Can I use my own voice with Goblins?

Yes. Teachers can record their voice and take a selfie to create a custom 3D avatar in about 30 seconds. Students then hear help in their own teacher's voice and see a familiar face, making the experience more personal and effective.

What math levels does Goblins cover?

Goblins covers math from Grade 5 through AP Calculus, including thousands of standards-aligned topics. Teachers can also upload their own content for custom assignments at any level.

Is Goblins FERPA compliant?

Yes. Goblins is FERPA and state compliant. Student data privacy and security are a top priority.

Does Goblins support English Language Learners?

Yes. Goblins supports 30+ languages so teachers don't have to translate every worksheet. It is especially helpful for ELL students who need accessible math instruction in their native language.

HSF.LE.A.2

Construct linear and exponential functions, including arithmetic and geometric sequences, given a graph, a description of a relationship, or two input-output pairs (include reading these from a table).

Example Problems

f(x) = \frac{5}{1 - 3x}

Find the power series for f.

f(x) = \frac{2}{1 + 4x}

Find the power series for f.

f(x) = \frac{9}{1 - 2x}

Find the power series for f.

Khan Academy Resources

Forms of linear equations review Arithmetic sequences review Explicit formulas for arithmetic sequences Writing slope-intercept equations Intro to slope-intercept form Point-slope form review Slope review Slope-intercept form review Geometric sequences review Recursive formulas for arithmetic sequences Point-slope form Exponential functions from tables & graphs Recursive formulas for arithmetic sequences Writing linear equations word problems Writing functions with exponential decay Slope-intercept from two points Horizontal & vertical lines Recursive formulas for geometric sequences Slope from graph Explicit formulas for geometric sequences Linear models word problems Slope-intercept equation from graph Sequences word problems Linear equations in any form Exponential expressions word problems (algebraic)Explicit formulas for arithmetic sequences Construct exponential models Linear vs. exponential growth: from data Slope (more examples)Slope-intercept equation from graph Slope-intercept form problems Intro to exponential functions Arithmetic sequence problem Worked example: slope from graph Writing linear equations in all forms Slope of a horizontal line Slope-intercept equation from slope & point Slope-intercept equation from two points Constructing exponential models: percent change Constructing exponential models: half life Explicit & recursive formulas for geometric sequences Linear models word problem: book Linear functions word problem: iceberg Linear functions word problem: paint Point-slope & slope-intercept equations Constructing exponential models (old example)Writing exponential functions from tables Sequences word problems Positive & negative slope Constructing linear equations from context Intro to point-slope form Linear models word problem: marbles Initial value & common ratio of exponential functions Writing exponential functions from graphs Intro to slope-intercept form Writing functions with exponential decay Horizontal & vertical lines Writing exponential functions Constructing exponential models Modeling with basic exponential functions word problem Exponential expressions word problems (algebraic)Explicit formulas for arithmetic sequences Intro to slope Recursive formulas for arithmetic sequences

1-on-1 AI tutoring aligned to HSF.LE.A.2. Instant help for students, real-time insights for teachers.

Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.

Free for teachers, forever →