SOLUTION: On this problem I know what to do, I just do not know how to do it. I think I droped my brain somewhere and left it, cause this is something I should be able to do!! 4x^2-15x=3

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: On this problem I know what to do, I just do not know how to do it. I think I droped my brain somewhere and left it, cause this is something I should be able to do!! 4x^2-15x=3      Log On


   

Question 137955: On this problem I know what to do, I just do not know how to do it. I think I droped my brain somewhere and left it, cause this is something I should be able to do!!
4x^2-15x=3
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!
4x%5E2-15x=3

Put it in standard form:
4x%5E2-15x-3=0

This one does not have an integer or rational factorization, so you can either complete the square (not recommended because the numbers are ugly), or use the quadratic formula:

x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-%28-15%29+%2B-+sqrt%28+%28-15%29%5E2-4%2A4%2A%28-3%29+%29%29%2F%282%2A4%29+

You should be able to simplify that.