Question

(x/3 - y/2) (x/3+y/2) find the product using identity III​

Answer 1

Answer:

Given, (2x+5y)(2x+3y).

We know, (x+a)(x+b)=x

2

+(a+b)x+ab.

On comparing, we get,

x=2x,a=5y,b=3y.

Thus,

(2x+5y)(2x+3y)

=(2x)

2

+(5y+3y)2x+(5y)×(3y)

=4x

2

+(8y)2x+15y

2

=4x

2

+16xy+15y

2