Question

h) x² -5= -2x² + 6x + 4​

Answer 1

Resposta:

$x² -5= -2x² + 6x + 4 \\ {x}^{2} - 5 + {2x}^{2} - 6x - 4 = 0 \\ {3x}^{2} - 9 - 6x = 0 \\ {x}^{2} - 3 - 2x = 0 \\ {x}^{2} - 2x - 3 = 0 \\ {x}^{2} + x - 3x - 3 = 0 \\ x \times (x + 1) - 3(x + 1) = 0 \\ (x + 1) \times (x - 3) = 0 \\ x + 1 = 0 \\ x - 3 = 0 \\ x = - 1 \\ x = 3 \\ x1 = - 1 \: \: \: \: \: \: x2 = 3$