Question

Resolva as equaçoes A) x² - 10x =11=0

Answer 1

$x^{2} -10x-11=0\\\\a=1;b=-10;c=-11\\\\\\ \Delta= b^{2} -4ac\to \Delta=(-10 )^{2} -4*1*(-11)\to \Delta=100+44\to \\\Delta=144\\\\\\x= \frac{-b+- \sqrt{\Delta} }{2*a}\to x= \frac{-(-10)+- \sqrt{144} }{2*1}\to x= \frac{10+-12}{2}\\\\\\x'= \frac{10+12}{2}\to x'= \frac{22}{2}\to x'=11\\\\\\ x''= \frac{10-12}{2}\to x''= \frac{-2}{2}\to x''=-1\\\\\\S=(-1;11)$

Answer 2

x² - 10x - 11 = 0
Delta = b² - 4ac
Delta = 100 - 4(1)(-11)
Delta = 100 + 44
Delta = 144

X = (-b +- raiz delta) / 2a
X = (10 +- 12) / 2
x' = (10 + 12) / 2 = 22/2 = 11
x" = (10 - 12) / 2 = -2/2 = -1