Question

using suitable identities to find the following products. (2x+4)(3x+10)​

Answer 1

We use identities

(x+a)(x+b)=x2+(a+b)x+ab and x2−y2=(x+y)(x−y)

for example :

(i) (x+4)(x+10)

=x2+(4+10)x+(4)(10)

=x2+14x+40