Question

The value of (0.63)^2-(0.32)^2
a.0.22
b.0.29
c.0.42
d.0.51

Answer 1

Answer:

${a}^{2} - {b}^{2} = (a + b)(a - b)$

$( \frac{63}{100} + \frac{32}{100} )( \frac{63}{100} - \frac{32}{100} ) \\ = (\frac{63 + 32}{100} )( \frac{63 - 32}{100} ) \\ =( \frac{95}{100} )( \frac{31}{100} ) \\ = 0.04064256$

c. 0.42

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