Question

Alguém consegue resolver isso??

A ) X2 -7x + 10= 0
B) 2x2 - 10 - 12 = 0
C) 8x2 - 7 = 0
D) 1 + 12x = 9x2

Answer 1

Letra A

Resolvendo com bhaskara
∆= b² - 4.a.c
∆= (-7)² - 4 . 1 . 10
∆ = 49 - 40
∆ = 9

$\frac{ - ( - 7) + 3}{2}$
x, = 5

$\frac{ - ( - 7) - 3}{2}$

x,,= 2