Question

10-15 ! найти корень рівняння (у-5)*(3x+9)=0

Answer 1

$(x- 5) \times (3x + 9) = 0 \\ \\ 3x {}^{2} + 9x - 15x - 45 = 0 \\ \\ 3x {}^{2} - 6x - 45 = 0 \\ \\$

D = ( -6 )² - 4 * 3 * ( -45 ) = 36 + 540 = 576

$x1 = \frac{6 - 24}{2 \times 3} \\ \\ x2 = \frac{6 + 24}{2 \times 3} \\ \\ x1 = - 3 \\ \\ x2 = 5$

~•~•~•ZLOY_TIGROVSKIY~•~•~•