Radicals, Rational Exponents, and Complex Numbers: mastery answer key

Repair a solution that skips “An odd power preserves sign.” while solving: Determine whether the real sixth root of $-64$ and the cube root $\sqrt[3]{-64}$ exist.

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In this general nth roots and principal roots case, change one numerical value, solve the revised problem, and identify which parts of the original method still apply: Evaluate $\sqrt[3]{-125}$ and compare $\sqrt{36}$ with the solutions of $x^{2} = 36$.

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Connect the opening situation “Compare root notation with the solutions to $x^2=9$.” to the algebraic structure used in the worked case. Define quantities and units before writing any equation.

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Explain why the method for general nth roots and principal roots is valid here and name one nearby problem where it would not apply.

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Compare the conclusions of all three worked cases with this lesson outcome—Distinguish the principal root operation from finding every solution of a power equation. Explain what remains invariant across them.

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Exit check: solve and verify without referring to the displayed steps. Evaluate the principal fourth root of $81$ and solve $x^{4} = 81$ over the real numbers.

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Exit check: solve and verify without referring to the displayed steps. Determine whether the real sixth root of $-64$ and the cube root $\sqrt[3]{-64}$ exist.

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Classify the mathematical object and requested action in this lesson case: Simplify $\sqrt{432}$ exactly.

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State the central definition behind this outcome: Extract perfect-power factors and retain exact form.

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Before calculating, list every sign, endpoint, unit, grouping, or domain condition that can affect: Simplify $\sqrt{432}$ exactly.

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Explain why this opening move is valid: Factor $432$ as $144\cdot 3$.

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Simplify $\sqrt{432}$ exactly.

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Simplify$$\sqrt{180}$$

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Simplify$$\sqrt[3]{54a^{7}b^{4}}$$

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Verify the proposed result “$12\sqrt{3}$.” against the original statement.

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Complete the calculation after “Factor $180$ as $36\cdot 5$.” in this problem: Simplify $\sqrt{180}$.

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Name and justify the most efficient first move, then solve: Simplify $\sqrt[3]{54a^{7}b^{4}}$.

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Compare the methods used in these two cases and identify the structural reason they differ: Simplify $\sqrt{180}$. Simplify $\sqrt[3]{54a^{7}b^{4}}$.

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Create the representation most useful for checking this result: Simplify $\sqrt{180}$. Coordinate radical form, rational-exponent form, exact value, and the real or complex domain.

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A learner reports “$12\sqrt{3}$.” but omits the original-condition check. Explain the risk before deciding whether the result is supported.

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Repair a solution that skips “Extract cube factors $27, a^{6},$ and $b^{3}$.” while solving: Simplify $\sqrt[3]{54a^{7}b^{4}}$.

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In this simplifying radicals case, change one numerical value, solve the revised problem, and identify which parts of the original method still apply: Simplify $\sqrt{432}$ exactly.

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Connect the opening situation “Decompose an area or length under a radical.” to the algebraic structure used in the worked case. Define quantities and units before writing any equation.

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Explain why the method for simplifying radicals is valid here and name one nearby problem where it would not apply.

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