Question

-20=-x -x2 equação ajudem pf

Answer 1

-20=-x-x²
x²+x-20=0

Delta = b² - 4.a.c
Delta = 1² - 4.1.(-20)
Delta = 81

X= -b+ou-$\sqrt{delta}$/2a

X'=-1+9/2 >> 4
X''=-1-9/2 >> -5