Question

equação. mim ajuda ae galera.

-10x( -20-8x)=5x-20+40

Answer 1

-10x(-20-8x) = 5x+20 *(-1)
10x(-20-8x) = -5x-20
-20-8x = (-5x-20)/10x
-20-8x = (x+4)/-2x
-2x*(-20-8x) = x+4
40x + 16x² = x+4
16x²+40x-x-4 = 0
16x²+39x-4 = 0
/\ = 1521 + 256
/\ = 1265

x = (39+/-\/2165)/2*16
x = (39+/-35,56)/32
x' = (39+35,56)/32 --> x' = 2,33
x" = (39-35,56)/32 --> x" = 0,1075