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Mathematics

Grade10

Easy

Question

Find the product. (3a – 4b)(3a + 4b)

$9 a^{2} - 16 b^{2}$
$9 a^{2} + 16 b^{2}$
$9 a^{2} - 24 a b + 16 b^{2}$
$9 a^{2} + 24 a b - 16 b^{2}$

The correct answer is: $9 a squared – 16 b squared$

Using the pattern $left parenthesis a plus b right parenthesis left parenthesis a – b right parenthesis equals a squared – b squared comma$
$left parenthesis 3 a plus 4 b right parenthesis left parenthesis 3 a – 4 b right parenthesis equals 9 a squared – 16 b squared$

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