How do you multiply $(8x + 9)(8x + 3)$ ?

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Answer 1 · 2017-09-11T15:31:52

$64x^2 + 96x + 27$

We have,
$y = (8x + 9) (8x + 3)$

$implies y = 8x(8x + 9) +3 (8x + 9)$

$implies y = 64x^2 + 72x + 24x + 27$

Collect like terms

$y = 64x^2 + (72x + 24x) + 27$

$implies y = 64x^2 + 96x + 27$

Therefore,

$(8x + 9) (8x + 3) = 64x^2 + 96x + 27$

How do you multiply (8x + 9)(8x + 3) (8x + 9)(8x + 3) ?