Question

evualate the given product without multiply directly ( x+3) (x-5)
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Answer 1

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

$using \: 4th \: identity$

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

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

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