Inactive Tutor answered • 01/25/18
Tutor
New to Wyzant
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
T Y.
asked • 01/25/18ACT math help
If a+b= -8 and a2+b2=50, what is the value of ab?
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2 Answers By Expert Tutors
Inactive Tutor answered • 01/25/18
Tutor
New to Wyzant
a + b = -8
a2 + 2ab + b2 = 64
50 + 2ab = 64
2ab = 14
ab = 7
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