Question

X elevado a 2 menos 14x mais 49 igual a 0

Answer 1

$\large\boxed {\boxed{\boxed{{Ol\'a\:Carlos}}}}}$

$x^2-14x+49=0$

onde:

a = 1 ; b = —14 e c = 49

$\LARGE{x_{1},_{2}=\frac{-b±\sqrt{b^2-4.a.c}}{2.a}}$

$\LARGE{x_{1},_{2}=\frac{14±\sqrt{(-14)^2-4.1.49}}{2.1}}$

$\LARGE{x_{1},_{2}=\frac{14±\sqrt{196-196}}{2}}$

$\LARGE{{x_{1},_{2}=\frac{14±\sqrt{0}}{2}}}$

$\LARGE{x_{1},{2}=\frac{14±0}{2}}$

$\LARGR{x_{1},_{2}=\frac{14}{2}}$

$x_{1},{2}=7$