225=(100-x)x x=?

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225=(100-x)xx=?225=(100-x)xx=?225=(100-x)xx=?225=(100-x)x225=100x-x²x²-100x=-225x²-10

225=(100-x)x x=?
225=(100-x)x x=?

225=(100-x)x x=?
225=(100-x)x
225=100x-x²
x²-100x=-225
x²-100x+2500=-225+2500
(x-50)²=2225
x-50=±√2225=±5√89
x=50±5√89