Question

factorise :

want the answer right now$x^{2} + 21x + 20$​

Answer 1

Step by step explanation:
Given: x2 + 21x + 20

We need 2 factors which when multiplied give 20 and when added give 21

1 x 20 = 20
1 + 20 = 21

So the factors are 1 and 20

Splitting 20 x into 1x and 20x we get

x2 + 1x + 20x + 20

Take out the common terms

x(x + 1) + 20(x + 1) = 0

Group them

(x + 20) (x + 1) = 0

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