Question

(80-2x)(1200+200x)-1600x=176000

Answer 1

(80-2x)(1200+200x)-1600x=176000
96000+16000X-2400X-400X²-1600X=176000
78400+12000X-400X²=0
784+120X-4X²=0
196+30X-X²=0
X²-30X=196
X²-30X+225=196+225
(X-15)²=421
X-15=±421开平方
X=±421开平方+15

Answer 2

400(40-x)(6+x)-1600x=176000
(40-x)(6+x)-4x=440
240+34x-x²-4x=440
x²-30x+200=0
(x-20)(x-10)=0
x=20 x=10