Question

4х(2х-1)-(х-3)(х+3)​

Answer 1

$8x {}^{2} - 4x - { x}^{2} - 9$

$7x {}^{2} - 4x - 9 = 0$

D=

$16 - 4 times 7 times ( - 9) = 268$

$x = frac{4 - sqrt{268} }{14}$

$x = frac{4 + sqrt{268} }{14}$