Question

Find the value of $\frac{0.23^2-0.04^2}{0.09}$

• A. 0.52
• B. 0.01
• C. 3
• D. 0.57

Answer 1

Answer:

D. 0.57

Formula:

a² - b² = (a - b) $\times$ (a + b)

Calculation:

$\frac{0.23^2-0.04^2}{0.09}$

$⇒\frac{(0.23+0.04)\times{(0.23-0.04)}}{0.09}$

$⇒\frac{(0.27)\times(0.19)}{0.09}$

$⇒3\times{0.19}$

∴ The answer is 0.57.