Question

5. Simplify by using suitable identity. i) (x+5)(x+8)

Answer 1

$\underline { \blue { By \: Algebraic\: Identity }}$

$\boxed {\pink { (x+m)(x+n) = x^{2} + (m+n)x + mn }}$

$Here , \: (x+5)(x+8) \\= x^{2} + (5+8)x+ 5 \times 8 \\= x^{2} + 13x + 40$

Therefore.,

$\red {(x+5)(x+8)}\green {= x^{2} + 13x + 40 }$

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