x-determinant-2-2x-15-0-

Question Number 34567 by jordan last updated on 08/May/18

x | \begin{matrix} 2 \end{matrix} | - 2 x - 15 = 0

Answered by tanmay.chaudhury50@gmail.com last updated on 08/May/18

x^{2} i s a l e a y s p o s i t i v e h e n c e ∣ x^{2} ∣= x^{2}

x^{2} - 2 x - 15 = 0

(x - 5) (x + 3) = 0

x = 5, - 3