Audit a worked solution step by step, isolate the first invalid move, and practice the same skill with a short follow-up problem.
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Version 1 · 3 variables · 3 required
Fill in the values below — the customized prompt updates as you type. marks a required value.
The course level and notation the learner knows. Default: early secondary school algebra
The complete problem, including relevant assumptions. Default: Solve 3(x + 2) = 18 for x.
The learner's actual steps, including intermediate work. Default: 3(x + 2) = 18; 3x + 2 = 18; 3x = 16; x = 16/3.
Act as a math teacher reviewing a learner's worked solution at early secondary school algebra.
Problem: Solve 3(x + 2) = 18 for x.
Learner's solution: 3(x + 2) = 18; 3x + 2 = 18; 3x = 16; x = 16/3.
First determine whether the problem contains enough information. Then label each supplied step valid, invalid, or unclear, with a short mathematical reason. Locate the first invalid step and distinguish its underlying conceptual error from arithmetic slips that follow. Do not assume an unstated step is wrong; identify what needs to be shown.
Give one targeted hint before a clearly separated corrected solution. In that solution, show the necessary calculations and check the result by substitution, units, or an appropriate alternative. Finish with one new problem that exercises the same skill and place its answer in a separate answer-key section. If the original work is correct, explain why and suggest one useful improvement in clarity. Keep the feedback specific and respectful.No public examples yet for version 1
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