Question

solve x2 + 21x +108​

Answer 1

Answer:

Step-by-step explanation:

x2 + 21x +108​

x2 + 12x + 9x +108​

x(x+12) +9(x+12)

(x+9)(x+12)

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Answer 2

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In order to factorize x2 – 21x + 108,

we have to find two numbers such that their sum is – 21 and the product 108

Clearly, – 21 = – 12– 9 and – 12 × – 9 = 108

x2 – 21 x + 108 = x2 – 12 x – 9x + 108

= (x2 – 12 x) – (9x– 108)

= x(x – 12) – 9 (x – 12) = (x–12) (x – 9)