Question

qual e a resposta dessa conta x elevado dois -7x+12=0

Answer 1

a=1  b=-7  c=12

$x= \frac{ -b_{-}^+\sqrt{b^2- 4.a.c}}{2.a}$

$x= \frac{ -(-7)_{-}^+\sqrt{-7^2- 4.1.12}}{2.1}$

$x= \frac{ 7_{-}^+\sqrt{49- 48}}{2}$

$x= \frac{ 7_{-}^+\sqrt{1}}{2}$

$x= \frac{ 7_{-}^+{1}}{2}$

$x^I= \frac{ 7+{1}}{2}= \frac{8}{2} = 4$

$x^I^I= \frac{ 7-{1}}{2}= \frac{6}{2} = 3$

Resposta: $x^I=4$ e $x^I^I=3$