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AMAYTRIPATHI:
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(a+1/a) = 7
(a+1/a)^3 = 7^3 ( cubing both sides )
a^3 + 1/a^3 +3ab(a+b) = 343
a^3 + 1/a^3 + 3*a*1/a(a+b) = 343
a^3 + 1/a^3 +3(a+1/a) = 343
a^3 + 1/a^3 + 7*3 = 343
a^3 + 1/a^3 = 343 - 21
a^3 + 1/a^3 = 322
hope it helps you
(a+1/a)^3 = 7^3 ( cubing both sides )
a^3 + 1/a^3 +3ab(a+b) = 343
a^3 + 1/a^3 + 3*a*1/a(a+b) = 343
a^3 + 1/a^3 +3(a+1/a) = 343
a^3 + 1/a^3 + 7*3 = 343
a^3 + 1/a^3 = 343 - 21
a^3 + 1/a^3 = 322
hope it helps you
is it right????
yes
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kon sa idenity
(a+ b)^3 = a^3+ b^3 + 3ab(a+b)
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