Question

desenvolva:

a) (x+y+1)²

b) (4+x).(4-x)

c) (x+2).(x-1)

Answer 1

(a+b+c)² = a²+b²+c²+2ab+2ac+2bc

ps ---> * = multiplicação

a) x²+y²+1²+2xy+2*1*x+2*y*1
x²+y²+1+2xy+2x+2y

b) 16-4x+4x-x²
-x²+16

C) x²-x+2x-2
x²+x-2