Question

4х(2х-1)-(х-3)(х+3)​

Answer 1

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

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

D=

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

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

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