Question

+2x²+4-30=0 ax²+b1-c=0 comprobación​

Answer 1

$2 {x}^{2} + 4 - 30 = 0 \\ 2 {x}^{2} - 26 = 0 \\ {x}^{2} - 13 = 0 \\ {x}^{2} = 13 \\ x = - \sqrt{13} \\ x = \sqrt{13}$

...

$a {x}^{2} + b1 - c = 0 \\ a {x}^{2} + b - c = 0 \\ a {x}^{2} = - b + c \\ {x}^{2} = \frac{ - b + c}{a} \\ x = \frac{ \sqrt{ - ba + ca} }{a} \\ x = - \frac{ \sqrt{ - ba + ca} }{a}$