Question

X(X-1)=156



EQUACAO DO 2 GRAU

Answer 1

x.x + x.(-1)=156
$x^{2} -x=156$
$x^{2} -x-156=0$

Answer 2

vamos lá...

x(x-1)=156
x²-x=156
x²-x-156=0

a=1
b=-1
c=-156

Δ=b²-4ac
Δ=(-1)²-4(1)(-156)
Δ=1+624
Δ=625

x=(-b±√Δ)/2a=[-(-1)±√625]/2=(1±25)/2

x'=(1+25)/2=26/2=13
x"=(1-25)/2=-24/2=-12

S={-12,13}