which of these result to x²-81?a.(x-5)(x-5)b.(x-5)²c (x-9)(x-9)d.(x+9)(x-9). Created by delacruzdhen7. Math

Answer:D. (x+9)(x-9)Step-by-step explanation:Checking:

which of these result to x²-81?a.(x-5)(x-5)b.(x-5)²c (x-9)(x-9)d.(x+9)(x-9)...

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which of these result to x²-81?
a.(x-5)(x-5)
b.(x-5)²
c (x-9)(x-9)
d.(x+9)(x-9)

Which of these result to x^2 - 81?

A. (x - 5)(x - 5)

B. (x - 5)^2

C. (x - 9)(x - 9)

D. (x + 9)(x - 9)

Solution:

${ \tt{ {x}^{2} - 81 }} \\ { \tt{ {x}^{2} - {9}^{2} }} \\ { \tt{(x + 9)(x - 9)}}$

Since both terms are perfect squares, factor using difference of squares formula.

${ \tt{{a}^{2} - {b}^{2} = (a+ b)(a - b) }}$

Where,

a = x

b = 9

${ \color{purple}{ \boxed{Ate \: Itz :)) }}}$

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