Question

me ajuda e para amanhã​

Answer 1

Resposta:

a) -2y²+16y-6. d) x-1.

b) 9x²+5x-8. e) -2x²-3.

c) 4y²-8y-4.

Explicação passo-a-passo:

a) (y²+4y-5)+(-3y²+12y-1)=

y²+4y-5-3y²+12y-1=

y²-3y²+4y+12y-5-1=

-2y²+16y-6

b) (x²+12x-9)-(-8x²+7x-1)=

x²+12x-9+8x²-7x+1=

x²+8x²+12x-7x-9+1=

9x²+5x-8

c) (y²+4y-5)-(-3y²+12y-1)=

y²+4y-5+3y²-12y+1=

y²+3y²+4y-12y-5+1=

4y²-8y-4

d) (4x-2)+(-3x+1)=

4x-2-3x+1=

4x-3x-2+1=

x-1

e) (x²-7x+1)-(3x²-7x+4)=

x²-7x+1-3x²+7x-4=

x²-3x²-7x+7x+1-4=

-2x²-3