Question

Calcule:
a) (3 + x)² =
b) (x + 5)² =
c) ( x + y)² =
d) ( 3x + 2)² =
e) (2x + 1)² =

Answer 1

Explicação passo-a-passo:

a) (3+x).(3+x)=

3.3+3.x+3.x+x.x=

9+6x+x²

b) (x+5).(x+5)=

x.x +5x+5x+5.5=

x²+10x+25

c) (x+y).(x+y)=

x.x+x.y+x.y+y.y=

x² +2xy+y²

d) (3x+2).(3x+2)=

3x.3x +3x.2+3x.2+2.2=

9x²+6x+6x+4=

9x²+12x+4

e) (2x+1).(2x+1)=

2x.2x +2x.1+2x.1+1.1=

4x²+2x+2x+1=

4x²+4x+1