If a+b=10 and ab=21 find the value of acube + b cube
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a+b= 10
ab= 21
a3+b3= (a+b) (a2+b2-ab)
(a+b)2= a2+b2+2ab
10^2= a2+b2+2x21
100= a2+b2+42
100-42= a2+b2
a2+b2= 58
a3+b3= 10x 58-(21)
a3+b3= 10x 37.
a3+b3= 370
I hope it help you ☺️☺️
ab= 21
a3+b3= (a+b) (a2+b2-ab)
(a+b)2= a2+b2+2ab
10^2= a2+b2+2x21
100= a2+b2+42
100-42= a2+b2
a2+b2= 58
a3+b3= 10x 58-(21)
a3+b3= 10x 37.
a3+b3= 370
I hope it help you ☺️☺️
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