Question

Find the product of (7x+5y)(7x+5y) using identity . and (x-2y) (x+2y)​

Answer 1

Answer:

a)49x^2 +70xy +25y^2

b)x^2-4y^2

Step-by-step explanation:

a) (7x+5y)(7x+5y)

=(7x+5y)^2

=(7x)^2 +2*7x*5y + (5y)^2     ( (a+b)^2 = a^2 + 2ab + b^2)

=49x^2+70xy+25y^2

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

=(x)^2 - (2y)^2    ( (a+b) (a-b) = a^2 - b^2)

=x^2 - 4y^2