Question

evaluate the following 4.15×3.85

Answer 1

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$4.15 \times 3.85 \\ (4 + 0.15)(4 - 0.15) \\ = (4) {}^{2} - (0.15) {}^{2} \\ = 16 - 0.0225 \\ = 15.9775$
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Answer 2

$\huge\ {\red{\boxed{\bold{\boxed{solution}}}}}$

$4.1 5\times 3.85 \\ = (4 + 0.15)(4 - 0.15) \\ = {(4)}^{2} - {(0.15)}^{2} \\ = 16 - 0.0225 \\ = 15.9775$