Question

X^2+4x-13x^2+2-(4x+9)-4x^2

Answer 1

${x}^{2} + 4x - {13x}^{2} + 2 - (4x + 9) - {4x}^{2}$

$- {12x}^{2} + 4x + 2( - 4x +9) - 16x$

$- {12}^{2} + 4x - 8x + 18 - 16x$

$12 {x}^{2} - 4x + 18 - 16x$

$12 {x}^{2} - 4x - 16x + 18 = 0$

$12 {x}^{2} - 12x + 18 = 0$

use quadratic equation
by this formula
−b±√b^2−4(ac)
----------------------
2a