SOLUTION: three times the square of a number plus 10 is 85.Find the number.

Question 270625: three times the square of a number plus 10 is 85.Find the number.
Found 2 solutions by rfadrogane, bubbles1301:
Answer by rfadrogane(214) (Show Source): You can put this solution on YOUR website!
Let: x - be the number
^ - means raised
3x^2 + 10 = 85
3x^2 = 85 - 10
3x^2 = 75 --divide by 3 on both side
x^2 = 25 -- take the sq. root on both side
x = +5 and -5 ----answers

Answer by bubbles1301(1) (Show Source): You can put this solution on YOUR website!

Solved by pluggable solver: DESCRIBE a linear EQUATION: slope, intercepts, etc

Equation describes a sloping line. For any
equation ax+by+c = 0, slope is .
X intercept is found by setting y to 0: ax+by=c becomes ax=c. that means that x = c/a. 8/4 = 2.
Y intercept is found by setting x to 0: the equation becomes by=c, and therefore y = c/b. Y intercept is 8/2 = 4.
Slope is -4/2 = -2.
Equation in slope-intercept form: y=-2*x+4.

RELATED QUESTIONS
the sum of a number plus four times the number is 85. What is the... (answered by DrBeeee)
when three times a number is added to the square of a number the result is 10. Find the... (answered by ewatrrr)
When three times a number is added to the square of a number, the result is 10. Find the... (answered by LinnW)
Five plus three times a number is seven times the number. Find the... (answered by ikleyn)
two times a number plus three times another number equals 4.three times the first number... (answered by richwmiller)
Two times a number plus the square of the number equals 35. Find the... (answered by richwmiller)
Two times a number plus the square of the number equals 35. Find the... (answered by prateek)
Two times a number plus the square of the number equals 48. Find the number. (answered by TimothyLamb,ptfile)
When 10 is added to the square of a positive number, the result is equal to three times... (answered by lwsshak3)