SOLUTION: slove by the quadratic formula. 4x to the second power+11x-20=0

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Question 150261This question is from textbook Glencoe McGraw-Hill
: slove by the quadratic formula.
4x to the second power+11x-20=0 This question is from textbook Glencoe McGraw-Hill

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
4X^2+11X-20=0
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
X=(-11+-SQRT[11^2-4*4*-20])/2*4
X=(-11+-SQRT[121+320])/8
X=(-11+-SQRT441)/8
X=(-11+-21)/8
X=(-11+21)/8
X=10/8
X=5/4 ANSWER.
X=(-11-21)/8
X=-32/8
X=-4 ANSWER.