The sum of two expression is ( x²+9x-13). If one of them ( x²-5x+7) find other.
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Step-by-step explanation:
Let the other expression be f(x)
x²+9x-13=x²-5x+7+f(x)
9x-5x-13-7=f(x)
4x-20=f(x)
The other expression is 4x-20
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