Question

Factorise x^2+11x+18

Answer 1

(x+9) (x+2)

Explanation:

x^2+11x+18

x^2+9x+2x+18

x(x+9)+2(x+9)

(x+9) (x+2)

Answer 2

(x + 9)(x + 2 )

Explanation:

Sum =11

Product = 18

Factors = 9 , 2

When you multiply (9*2 = 18) and when you add (9 +2 = 11).

x² + 11x + 18 = x² + 9x + 2x + (9*2)

=x(x + 9) + 2(x + 9)

= (x + 9)(x + 2 )