Question

Find the product of (2a2 + 9) (2a2 - 4) by using identity
(x + a) (x + b) = x2 + (a+b)x + ab

Answer 1

Step-by-step explanation:

your answer is

${4a}^{2} + {10a}^{2} - 36$

Answer 2

$\: \: \: \: \: \: \: \: \: \: (2 {a}^{2} + 9)(2 {a}^{2} - 4)$

$\boxed{ \sf \red{(x + a)(x + b) = {x}^{2} + (a + b)x + ab}}$

$\sf{(2a {}^{2} ) {}^{2} + (9 + ( - 4))2 {a}^{2} + (9)( - 4)}$

$\: \: \: \: \: \: \: \: \: \: \: 4 {a}^{4} +( 5)2 {a}^{2} - 36$

$\: \: \: \: \: \: \: \: \: \: \: \: \: {4 {a}^{4} } + 10 {a}^{2} - 36$

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