Question

evaluate using identity (x-3)(x+5)
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Answer 1

answer:

x²-8x+15 is the answer

Step-by-step explanation:

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Answer 2

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$\bf (x - 3)(x + 5)$

Identity to be used :

$\bf (x + a)(x + b) \\ \bf = {x}^{2} + (a + b)x + (ab) \\ \\ \bf (x - 3)(x + 5) \\ \bf Here,~~x = x~~~~~~a = ( - 3)~~~~~~b = 5 \\ \bf = {x}^{2} + (- 3 + 5)x + ( - 3 \times 5) \\ \bf = {x}^{2} + 2x - 15$

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