If a + b = 7 and ab = 10, what is the value of a^2 + b^2?
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s.o.b.s for (a+b)=7
(a+b)^2=49
(a+b)^2= a^2+b^2+2ab=49
a^2+b^2=49-2ab=49-20=29
(a+b)^2=49
(a+b)^2= a^2+b^2+2ab=49
a^2+b^2=49-2ab=49-20=29
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