Penyelesaian dari persamaan 5log(x²-4x-12)=5log9

By Admin ReiPosted on December 11, 2022

Penyelesaian dari persamaan 5log(x²-4x-12)=5log9

${x}^{2} - 4x - 12 = 9 \ {x}^{2} - 4x - 12 - 9 = 0 \ {x}^{2} - 4x - 21 = 0 \ (x - 7)(x + 3) = 0 \ \ x - 7 = 0 \ x = 7 \ \ x + 3 = 0 \ x = - 3$

x1 = 7 dan x2 = -3