Question

решите неравенство x^2-7x-18≤0

Answer 1

Находим Дискриминат
$x^{2} - 7x - 18 leq 0 x^{2} - 7x - 18 = 0 D = 7^{2} - 4 * 1 * (-18) = 121 x^{1} = frac{-7+11}{2*1} = 2 x^{2} = frac{-7-11}{2*1} = -9 Otvet : x^{1} = 2 ; x^{2} = -9$