Question

Multiply:
a) (x + y)(x + y)
b) (3x + 2y)(3x - 2y)​

Answer 1

`a. x^2+2xy+y^2\\\\b. 9x^2-4y^2`

Explanation:

foil method

a. (x+y)(x+y) =

`x^2+xy+xy+y^2 simplify like terms\\x^2 + 2xy + y^2`

b. (3x+2y)(3x-2y) =
`9x^2-6xy+6xy-4y^2 simplify like terms\\9x^2-4y^2`