QuestionAugust 27, 2025

5. Evaluate x^3-y^2 if x=2 and y=(3)/(4) (Example 4)

5. Evaluate x^3-y^2 if x=2 and y=(3)/(4) (Example 4)
5. Evaluate x^3-y^2 if x=2 and y=(3)/(4)
(Example 4)

Solution
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Answer

\frac{119}{16} Explanation 1. Substitute the values Replace x with 2 and y with \frac{3}{4} in the expression x^3 - y^2. 2. Calculate x^3 Compute 2^3 = 8. 3. Calculate y^2 Compute \left(\frac{3}{4}\right)^2 = \frac{9}{16}. 4. Subtract y^2 from x^3 Calculate 8 - \frac{9}{16} = \frac{128}{16} - \frac{9}{16} = \frac{119}{16}.

Explanation

1. Substitute the values<br /> Replace $x$ with 2 and $y$ with $\frac{3}{4}$ in the expression $x^3 - y^2$.<br /><br />2. Calculate $x^3$<br /> Compute $2^3 = 8$.<br /><br />3. Calculate $y^2$<br /> Compute $\left(\frac{3}{4}\right)^2 = \frac{9}{16}$.<br /><br />4. Subtract $y^2$ from $x^3$<br /> Calculate $8 - \frac{9}{16} = \frac{128}{16} - \frac{9}{16} = \frac{119}{16}$.
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