Question

efetue:
a) x(x+2)=
b) (x+3)(x+7)=

Answer 1

a) x² + 2x
b) x² + 7x + 3x + 21
x² + 10x + 21

Answer 2

a)
x(x+2)
x*x + x*2
x² + 2x

b)
(x+3)(x+7)
x*x + x*7 + 3*x + 3*7
x² + 7x + 3x + 21
x² + 10x + 21