Factorise: x2 + 15x + 56

1.	Factorise: x2 + 15x + 56
Answer» First find the two numbers whose sum=15 and product=56 Clearly, the numbers are 7 and 8 ∴ we get, x² +15x + 56 = x²+ 7x +8x + 56 = x(x+7) + 8(x+7) = (x+7) (x+8)

Answer»

First find the two numbers whose sum=15 and product=56

Clearly, the numbers are 7 and 8

∴ we get, x² +15x + 56

= x²+ 7x +8x + 56

= x(x+7) + 8(x+7)

= (x+7) (x+8)

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