a+b =7 and ab = 12 , find a power 3 + b power 3
10 points
(a+b)2=a2+b2+2ab
72=a2+b2+2(12)
a2+b2=49−24=25
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(a+b)2=a2+b2+2ab
72=a2+b2+2(12)
a2+b2=49−24=25