Question

0,5x²- 7 = 2,5x СРОЧНО!!!!​

Answer 1

$0.5x {}^{2} - 7 = 2.5x \\ x {}^{2} - 14 = 5x {}^{2} \\ {x}^{2} - 14 - 5x = 0 \\ x {}^{2} - 5x - 14 = 0 \\ x {}^{2} + 2x - 7x - 14 = 0 \\ x \times ( x + 2) - 7(x + 2) = 0 \\ (x + 2) \times (x - 7) = 0 \\ x + 2 = 0 \\ x - 7 = 0 \\ x {}^{1} = - 2 \\ {x}^{2} = 7$