Question

factorise the following expression​

Answer 1

Answer:

(a+b-4)(a+b+4)

Step-by-step explanation:

=a^2 +b^2+2ab- 16

=(a+b)^2- 4^2

because ( wkt, (x+y)^2=x^2+y^2+2xy)

(a+b+4)(a+b-4) ( because p^2-q^2= (p+q)(p-q) here p=a+b and q = 4))

hence the required factirisation =

(a+b-4)(a+b+4)

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