500(1+x)(x+8%)=168
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![500(1+x)(x+8%)=168](/uploads/image/z/5625766-46-6.jpg?t=500%EF%BC%881%2Bx%EF%BC%89%EF%BC%88x%2B8%25%EF%BC%89%3D168)
500(1+x)(x+8%)=168
500(1+x)(x+8%)=168
500(1+x)(x+8%)=168
500(1+x)(x+8%)=168
500x+40+500x^2+40x=168
500x^2+540x-128=0
125x^2+135x-32=0
(5x-1)(25x+32)=0
x=1/5 x=-32/25
500(1+x)(x+8%)=168
500x+40+500x^2+40x=168
500x^2+540x-128=0
125x^2+135x-32=0
(5x-1)(25x+32)=0
x=1/5 x=-32/25