Question

Resolva a equaçao  x²/4 - x+4/10=8

Answer 1

1/4x^2-x+2/5=8
mmc entre 4 e 5
ai fica 5x^2-20x=152
x=1/5(10+/-raiz de 215
ou x= 7.865

Answer 2

$\frac{x^2}{4}-\frac{x+4}{10} = 8\\\\\ \frac{5x^2-2(x+4)}{20} = \frac{160}{20}\\\\\\ 5x^2-2x-8 = 160\\\\ 5x^2-2x-168=0$

$\Delta = 3364\\\\ x^1 = 6\\\\ x^2 = -5,6$