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If x+1 upon x is equal to 7 then what will be the value of x+1 upon x whole raised to 3 |
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Answer» x+1/x=7 → (1) SQUARING both sides x²+1/x²+2=49 x²+1/x²=47 → (2) MULTIPLY (1) and (2) x³+1/x³+1+1/x=329 x³+1/x³+7=329 x³+1/x³=322 Now, (x+1/x)³=x³+1/x³+3(x+1/x) =322+3(7) =322+21 =343 |
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