SOLUTION: solve using the quadratics formula rSQUARED+16r+21=0

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Question 81279: solve using the quadratics formula
rSQUARED+16r+21=0
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
R^2+16R+21=0
r+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
R=(-16+-SQRT[16^2-4*1*21])/2*1
R=(-16+-SQRT[256-84])/2
R=(-16+-SQRT172)/2
R=(-16+-13.11)/2
R=(-16+13.11)/2
R=-2.88/2
R=-1.44 ANSWER.
R=(-16-13.11)/2
R=-29.11/2
R=-14.555 ANSWER.