Question

( y²-y+9)= (2y²-5y+7)-(y²+4) resposta agr pvf

Answer 1

Boa noite

(y² - y + 9) = (2y² - 5y + 7) - (y² + 4)

y² - y + 9 = 2y² - 5y + 7 - y² - 4

y² - y + 9 = y² - 5y + 3

-y + 5y = 3 - 9

4y = -6

y = -6/4 
y = -3/2