Question

x(x+.4)(x-1)=2x(x+4)

Answer 1

x(x+4)(x-1)=2x(x+4)(x² + 4x ) (x -1)  = 2x² + 8x
x³  - x² + 4x² - 4x = 2x² + 8x
x³ -x² -2x² +4x² -4x - 8x = 0
x³ -3x² + 4x² -12x = 0
x³ + x² -12x = 0
x ( x² + x - 12 ) = 0

x' = 0

x² + x - 12 = 0

a = 1
b = 1
c =  -12

Δ = b² -4 .a . c

Δ = 1² -4 . 1 . (-12)
Δ = 1 + 48
Δ = 49

-b +- √Δ   /2 . a
-1 +- √49   /2 . 1
-1 + - 7   / 2

x" = -1 + 7 / 2
x" = 6 / 2
x" = 3

x"' = -1 - 7  /2
x"' = -8 / 2
x"' = -4

Resposta :   
x' = 0
x" = 3
x"' = -4

Answer 2

Resposta:

x"=4 valeu blz então blz blz