SOLUTION: 9x2(power 2) + 6x = -1. Put in quadratic formula and solve

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Question 596123: 9x2(power 2) + 6x = -1. Put in quadratic formula and solve
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+9x%5E2+%2B+6x++=+-1+
+9x%5E2+%2B+6x+%2B+1+=+0+
This is in the form +ax%5E2+%2B+b%2Ax+%2B+c+=+0+
The quadratic formula is
+x+=+%28-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29+%2F+%282%2Aa%29+
+a+=+9+
+b+=+6+
+c+=+1+
+x+=+%28+-6+%2B-+sqrt%28+6%5E2+-+4%2A9%2A1+%29%29+%2F+%282%2A9%29+
+x+=+%28+-6+%2B-+sqrt%28+36+-+36+%29%29+%2F+18+
+x+=+%28+-6+%2B-+sqrt%28+0+%29%29+%2F+18+
+x+=++-%286+%2F+18%29+
+x+=+-%281%2F3%29+ answer
check:
+x+%2B+1%2F3+=+0+
+3x+%2B+1+=+0+
This is a double root, so
+%28+3x+%2B+1+%29%2A%28+3x+%2B+1+%29+=+0+
+9x%5E2+%2B+6x+%2B+1+=+0+
OK