Question

Sendo x=3, e dado P(x)= -x³+2x²+yx-6, obter o valor de y

Answer 1

-3³+2*3²+y*3-6=0
-27+2*9+3y-6=0
-27+18+3y-6=0
-15+3y=0
3y=15
y=15/3
y=5

Answer 2

Boa noite..

-(3)^3 + 2 . (3)^2 + y . 3-6=0

(^ significa elevado)

-27+2 . 9+3y-6=0
-27+18+3y-6=0
-9+3y-6=0
3y-9-6=0
3y-15=0
3y= 15
y=15/3

y= 5

Tenha ótimos estudos ;))