Question 373560: The sum of a number cubed and 3 times the square of the number is 75 more than 25 times the number. Find the number. HInt: Let X= the number Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! x^3+3x^2=25x+75
x^3+3x^2-25x-75
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when you substitute x = -5 the expression is =0
(x+5) is a root
(x+5)(x-5)(x+3)=0
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5 , -5 ,-3 are the roots of the equation.
check by plugging the value in the equation to find the number
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m.ananth@hotmail.ca
