Question

Use Suitable identity and find the product.
a) (3x + 7) ( 3x – 3)
b) (2x + y) ( 2x + y)

Answer 1

Answer:

a) we know,

(x+a)(x+b)= x square+(a+b)x +ab

here,

(3x+7)(3x-3)= (3x)square+(7+(-3))×3x+7×(-3)

= 9x square-12x-21

b) we know,

(a+b)(a+b)=a square+2ab+b square

here,

(2x+y)(2x+y)= (2x)square+2×y×2x+y square

=4x square+4xy+y square

hope it helps

Answer 2

Step-by-step explanation:

a) (3x+7) (3x-3)

= 9x^2 -9x +21x -21

= 9x^2 +12x -21 this is the answer ( and if u want factorized form please comment)

b) (2x + y) (2x + y)

= 4x^2 +2xy +2xy +y^2

= 4x^2 +4xy +y^2 [this is the answer]