Bobosharif S. answered • 01/25/18
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a+b=-8
(a+b)2=a2+2ab+b2=(a2+b2)+2ab=50+2ab=64
50+2ab=64
25+ab=32
ab=32-25=7
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asked • 01/25/18ACT math help
If a+b= -8 and a2+b2=50, what is the value of ab?
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Mark M. answered • 01/25/18
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Mathematics Teacher - NCLB Highly Qualified
a + b = -8
a2 + 2ab + b2 = 64
50 + 2ab = 64
2ab = 14
ab = 7
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