Question : If $a + b = 11$ and $ab=35$, then what is the value of $\left(a^4+b^4\right)$?
Option 1: 151
Option 2: 261
Option 3: 124
Option 4: 102
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Correct Answer: 151
Solution :
Given,
$a + b = 11$ and $ab=35$
Consider, $a+b=11$
Squaring both sides, we get,
⇒ $(a+b)^2=11^2$
⇒ $a^2+b^2+2ab=121$
⇒ $a^2+b^2+2(35)=121$
⇒ $a^2+b^2+70=121$
⇒ $a^2+b^2=51$
Squaring both sides,
⇒ $(a^2+b^2)^2=51^2$
⇒ $a^4+b^4+2a^2b^2=2601$
⇒ $a^4+b^4+2(35)^2=2601$
⇒ $a^4+b^4+2\times1225=2601$
⇒ $a^4+b^4+2450=2601$
⇒ $a^4+b^4=2601-2450$
$\therefore a^4+b^4=151$
Hence, the correct answer is 151.
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