SOLUTION: how do u get x in the problem of x squared plus 3x minus 15 is equal to 0

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Question 394082: how do u get x in the problem of x squared plus 3x minus 15 is equal to 0
Found 2 solutions by solver91311, mananth:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


The first step is to stop disrespecting me by typing "u" when you mean "you."

Since there is no pair of integers and such that and , use the quadratic formula.

For



, , and

Plug the values into:



And do the necessary arithmetic to simplify it. Hint: cannot be simplified further. Leave your answer in radical form if you need the exact answers, or use your calculator to derive the appropriate numerical approximations.

John

My calculator said it, I believe it, that settles it
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Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
how do u get x in the problem of x squared plus 3x minus 15 is equal to 0
...
x^2-3x+15
Find the roots of the equation by quadratic formula
a= 1 , b = -3 , c = -15 .
b^2-4ac= 9+60=69
x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29
x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29
x1=%283%2Bsqrt%2869%29%29%2F%282%29
2.6533119314590374
...
x2=%28-b-sqrt%28b%5E2-4ac%29%29%2F%282a%29
x2=%283-sqrt%2869%29%29%2F%282%29
-5.653311931459037
,,,
m.ananth@hotmail.ca