Question

If x² + 5x – 84 = (x + a) (x + b) then a + b = ........​

Answer 1

Answer:

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Answer 2

we have,

x²+5x-84 = (x+a)(x+b)

x²+12x-7x-84 = (x+a)(x+b)

x(x+12)-7(x+12) = (x+a)(x+b)

(x+12)(x-7) = (x+a)(x+b)

so, a = 12 and b = -7

so, a+b = 5 ....ans.