SOLUTION: Solve by using any method. {{{ x^2 - 4x = 1 }}}

Algebra ->  Equations -> SOLUTION: Solve by using any method. {{{ x^2 - 4x = 1 }}}      Log On


   

Question 312236: Solve by using any method.
+x%5E2+-+4x+=+1+
Found 2 solutions by solver91311, checkley77:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Put it in standard form:



This one doesn't factor, so the easiest thing to do is to use the quadratic formula:











John

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
x^2 - 4x = 1
x^2-4x-1=0
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x=(4+-sqrt[-4^2-4*1*-1])/2*1
x=(4+-sqrt[16+4])/2
x=(4+-sqrt20)/2
x=(4+-4.472)/2
x=(4+4.472)/2
x=8.472)/2
x=4.236 ans.
x=(4-4.472)/2
x=-.472/2
x=-.236 ans.