If a+b=7 and ab=15 then find a^3 + b^3. Please answer asap
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We have, a^3 + b^3= (a+b)^3 - 3ab(a+b)
=7^3 - 3 ×15×7 = 343 - 315=28
=7^3 - 3 ×15×7 = 343 - 315=28
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