SOLUTION: I don't understand how to solve this equation {{{ x^2-4x+40=0 }}}

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Question 399219: I don't understand how to solve this equation +x%5E2-4x%2B40=0+
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Use the quadratic formula, which says that the roots of a polynomial in the form ax%5E2+%2B+bx+%2B+c are %28-b+%2B-+sqrt%28b%5E2+-+4ac%29%29%2F2a. Here, a+=+1, b+=+-4, c+=+40 so just replace each value and do the arithmetic.