Question

Using identities find the product.
(x-3) (x+5)
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Answer 1

Answer:

$(x - 3)(x + 5) \\ \\ x(x + 5) - 3(x + 5) \\ \\ x {}^{2} + 5x - 3x - 15 \\ \\ x {}^{2} + 2x - 15 \\ \\ x {}^{2} + 5x - 3x - 15 \\ \\ x(x + 5) - 3(x + 5) \\ \\ (x + 5)(x - 3) \\ \\ x = - 5 \\ x = 3$

Step-by-step explanation:

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Answer 2

Answer:

as we know that (a-b)(a+c)=${a}^{2}$-ac-ab-bc therefore ${x}^{2}$-5x-3x-15

${x}^{2}$-8x-15