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

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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) About Me  (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) About Me  (Show Source):
You can put this solution on YOUR website!
Solved by pluggable solver: DESCRIBE a linear EQUATION: slope, intercepts, etc
Equation 4+x+%2B+2+y+=+8 describes a sloping line. For any
equation ax+by+c = 0, slope is -a%2Fb+=+-4%2F2.
  • 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.
graph%28+500%2C+500%2C+2-8%2C+2%2B8%2C+4-8%2C+4%2B8%2C+-2%2Ax%2B4+%29+