Question

Find the product (x+y)(x-7y)

Answer 1

(x + y)(x - 7y)

x times x = $x^{2}$
x times -7y = -7xy
y times x = xy
y times 7y = 7y^2

Combine like terms -7xy + xy = -6xy

Answer:  $x^{2}$ - 6xy + 7y^2