Use suitable identities to products : (x+8)(x-10)

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2. Polynomials

easy

Use suitable identities to find the products : $(x+8)(x-10)$

Option A

Option B

Option C

Option D

Solution

$(x+8)(x-10)$

Here, $a=8$ and $b=(-10)$

$\therefore $ Using $(x+a)(x+b)=x^{2}+(a+b) x+a b$,

we have : $(x+8)(x-10) =x^{2}+[8+(-10)] x+[8 \times(-10)]=x^{2}+[-2] x+[-80] $

$=x^{2}-2 x-80 $

Standard 9

Mathematics

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