Question

Simplifique as expressões:
A-(2x+1)²+(3x+1)²
B-5x-(2x+3)²
C-(x+5)²-x(x+3)
Calcule:
A-(m-$\frac{1}{2}$)²
B-($\frac{a}{2}$-1)²

Answer 1

a)
(2x+1)²+(3x+1)²=
4x²+4x+1+9x²+6x+1=
13x²+10x+2

b)
5x-(2x+3)²=
5x-(4x²+12x+9_=
5x-4x²-12x-9=
-4x²-7x-9

c)
(x+5)²-x(x+3)=
x²+10x+25-x²-3x=
7x+25

$(m- \frac{1}{2} )^2=m^2-m+ \frac{1}{4}$

$( \frac{a}{2} -1)^2= \frac{a^2}{4} -a+1$