Question

find a^3 + 8b^3 if a+2b = 10 and ab= 15

Answer 1

Answer:

100

Step-by-step explanation:

(a+2b)^3=1000

=>a^3+8b^3+6a^2b+12ab>2=1000

=>a^3+8b^3+6ab(a+2b)=1000

=>a^3+8b^3+6×15×10=1000

=>a^3+8b^3=100

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