Question

Tolong jawab no 11 & 12 ya. butuh cepat..plis...

Answer 1

11) x²+8x-153=0
(x-9)(x+17)
x=9 x=-17

e. 9 dan -17

12) 2x²+11x-21=0
(x-3/2)(x+14/2)
x2=3/2 x1=-7
x1 + 2x2
=-7 + 2•3/2
=-7 + 3
=-4