Question

${x}^{2} - 7x + 10 = 0 \:$
qual é a resposta????
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Answer 1

Resposta:

Explicação passo-a-passo

$x=\dfrac{-(-7)\pm\sqrt{(-7)^{2}-4.1.10}}{2.1}\\\\\\x=\dfrac{7\pm\sqrt{49-40}}{2}\\\\x=\dfrac{7\pm\sqrt{9}}{2}\\\\x=\dfrac{7\pm3}{2}\\\\x'=\dfrac{7+3}{2}=\dfrac{10}{2}=5\\\\\\x"=\dfrac{7-3}{2}=\dfrac{4}{2}=2$

Answer 2

Equação do 2° Grau!!

x² - 7x + 10 = 0

Coeficientes :

A= 1
B= - 7
C= 10

∆= b² - 4ac

∆= ( - 7)² - 4 • 1 • 10
∆= 49 - 40
∆= 9

X= - b ± √∆ / 2a

X= - ( - 7) ± √9 / 2 • 1
X= 7 ± 3 / 2

x'=7 + 3/2 = 10/2 = 5
x''= 7 - 3/2 = 4/2 = 2

S= ( 2 , 5)