Solve by factoring: x4 + 12x2 -64 = 0?

1 ⤊

AND WHICH IS THE ANSWER.. (I'LL MAKE IT EASY)

a. x = 0 x = 1 x = 3 x = 8

b. x= 8 x = -8

c. x = 4i x = -4i x= 2 x= -2

2007-11-29 10:13:51 · 2 answers · asked by ♥ ღAngelicaღ♥ 2 in Science & Mathematics ➔ Mathematics

2007-11-29 10:18:00 · answer #1 · answered by Mr Brightside 7 · 1⤊ 0⤋

x^4+12x^2-64=0

(x^2+16)(x^2-4)=0
x^2+16=0
x^2=-16
x=4i -4i x=2 x=-2

2007-11-29 18:22:42 · answer #2 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋