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Answer to Question #27045 in Algebra for Cynara

Question #27045
When finding the value 2x^2-3x^2+5 when x=-5 the example in my book shows 2x^2-3x^2+5=2(-5)^3-3(-5)^2+5, my question is: why does the exponent become ^3 once -5 is plugged into the equation?
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