// Numbas version: finer_feedback_settings
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Part of HELM Book 1.3</p>", "licence": "Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International"}, "statement": "<p>Explain the distinction, if any, between each of the following expressions, and simplify if possible.</p>", "advice": "<p>(a) $\\var{q4aexpr} = \\var{q4aans}$</p>\n<p>This is a subtraction of like terms, so we subtract the coefficients.</p>\n<p>(b) $\\var{q4bexpr} = \\var{q4bans}$</p>\n<p>This is a product: $\\var{q4coeffs[0]}\\times\\var{ve}\\times\\var{q4coeffs[1]}\\times{\\var{ve}}$ so we multiply everything together.</p>\n<p>(c) $\\var{q4cexpr} = \\var{q4cans}$&nbsp;</p>\n<p>This is a product: $\\var{q4coeffs[0]}\\times\\var{ve}\\times\\var{-q4coeffs[1]}\\times{\\var{ve}}$ so we multiply everything together.</p>\n<p>Note that the second constant, $\\var{-q4coeffs[1]}$, is negative, so the final answer is negative.</p>\n<p>(d) $\\var{q4dexpr} = \\var{q4dans}$&nbsp;</p>\n<p>This is a subtraction of like terms, so we subtract the coefficients.</p>\n<p>(e) 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