Question

(x+4)(x-4)equal to 9

Answer 1

it was easy man just use the identity in this question

Answer 2

⍟ Hey! ⍟

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Question = (x+4)(x-4) = 9 Find value of x

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☆Solution :-

★Using without identity :)

★Multiply both :-

=> x² - 16 = 9

=> x² - 16 + 9 = 0

=> x² - 25 = 0

★We can write this as (x - 5)(x +5)

=> (x+5)(x-5) = 0

=> x - 5 = 0

=> x = 5

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★Now using Identity :-

(x - 4)(x + 4) = 9

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★Identity :-

(a + b)(a-b) = a² - b²

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(x + 4)(x - 4) = 9

=> (x)² - (4)² = 9

=> x² - 16 = 9

=> x² - 25 = 0

=> x = √25

=> x = 5

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Regards :)

⍟ Cybary ⍟

⍟ Be Brainly ⍟