Question

me socorram necessito urgente

Answer 1

2)
a) (x+y)²=x²+2xy+y²

b) (2a-3)²=4a²-12a+9

c) (2x+3y)(2x-3y)=4x²-9y²

3)
a)(x+y)²-2xy=x²+y²

b)(5-2z)²-(25+10z)= 4z²-30z

c)(3x+1)²+(3x-1)²-2= 18x²

d)(2-2x)²+(3-2x)²-2(x-3)=
4-8x+4x²+9-12x+4x²-2x+6=
12x²-20x+19

4)Desculpa eu não sei

5)
x+y=5
x-y=1

x=3
y=2

a)3x+3y=15
b)7x+7y=35
c)x²-y²=3

6)
A=x+2
B=2x-5
C=3x+4

a)B+AC
2x-5+3x²+10x+16
3x²+12x+11

b)C-AB
3x+4-(2x²-x-10)
-2x²+4x+14