SOLUTION: Please help me solve this problem: {{{ x^2-4x-9+0 }}}

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Question 7165: Please help me solve this problem:
+x%5E2-4x-9%2B0+
Answer by prabhjyot(165) About Me  (Show Source):
You can put this solution on YOUR website!
+x%5E2-4x-9=0+
The above equation is in the form of AX%5E2+%2B+BX+%2B+C+=+0
where A=1,B= -4 , c= -9
Roots of the quadratic equation is found by
x=+-b+%2B-+sqrt%28b%5E2+-4ac+%29+%2F2a+
Substututing the values of A,B, in the formula above
x+=+4+%2B-+sqrt+%28%28-4%29%5E2+-++4+%2A1%2A+-9%29%2F2
+x=+4%2B-+sqrt%28+16+%2B36%29%2F2
+x=+4%2B-+sqrt%2852%29%2F2
solving we get
x1= 5.6056
x2= -1.6056