SOLUTION: Four times a number is twelve less than its square. find all such numbers

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Question 793969: Four times a number is twelve less than its square. find all such numbers
Answer by sunny1992(35) About Me  (Show Source):
You can put this solution on YOUR website!
+4X=%28X%5E2%29-12+
+X%5E2+-+4x+-+12+=+0+
now by using quadratic formula or through factorization method or perfect square method solve for X.
here am using quadratic formula
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-%28-4%29+%2B-+sqrt%28+%28-4%29%5E2-4%2A%281%29%2A%28-12%29+%29%29%2F%282%2A1%29+
x+=+%28-%28-4%29+%2B-+sqrt%28+64+%29%29%2F%282%29+
x1+=+%28-%28-4%29+-+sqrt%28+64+%29%29%2F%282%29+=+%284-8%29%2F2+=+-2+
x2=+%28-%28-4%29+%2B+sqrt%28+64+%29%29%2F%282%29+=+%284%2B8%29%2F2+=6+