Question

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a. (4x+5)²
b. (7p-6)²
c. (4x+8) (4x-8)

Answer 1

Answer:

May be the answer of this question is.

A. 4x*2+2 x 4x x 5 + 5*2

= 16x*2 + 40x + 25

B. 7p*2 - 2 x 7p x 6 + 6*2

= 49p*2 - 84p + 36

C. 4x(4x-8) +8(4x-8)

= 16x*2 - 32x + 32x - 64

= 16x*2-64.

Hope it's helpful to you.

According to my point of view this is the correct answer.

Answer 2

$\sf \Large Solution!!$

$\sf \to$(4x + 5)² = (4x)² + (5)² + 2(4x)(5)

= 16x² + 25 + 40x

Identity used → (a + b)² = a² + b² + 2ab

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$\sf \to$ (7p - 6)² = (7p)² + (6)² - 2(7p)(6)

= 49p² + 36 - 84p

Identity used → (a - b)² = a² + b² - 2ab

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$\sf \to$ (4x + 8)(4x - 8) = (4x)² - (8)²

= 16x² - 64

Identity used → (a + b)(a - b) = a² - b²