SOLUTION: 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

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
>>
when you substitute x = -5 the expression is =0
(x+5) is a root
(x+5)(x-5)(x+3)=0
...
5 , -5 ,-3 are the roots of the equation.
check by plugging the value in the equation to find the number
..
m.ananth@hotmail.ca
RELATED QUESTIONS
six times the sum of a number and -15 is 76 more than four times the number. find the... (answered by stanbon)

sixteen more than the square of a number is 8 times the number. find the... (answered by Paul)

The square of a number is 20 more than 8 times the number. Find the... (answered by unlockmath)

one number is 5 more than another. if the sum of twice the smaller number and three times (answered by stanbon)

five less than the square of a positive number is 3 more than 2 times the number. find... (answered by mananth)

4 times the sum of a number and 3 is 4 more than twice the... (answered by drk)

The sum of 3 times a number and 10 is 25. Find the... (answered by stanbon)

three times the sum of a number and 3 is 15 less than the number times 7. Find the... (answered by rfer,macston)

The square of a negative number is 35 more than 2 times the negative number. Find the... (answered by ankor@dixie-net.com)