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If x = 2 -root 3 , find the value of 1/x^3 + x3 |
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Answer» ong>Answer: ANSWER a 3 −B 3 =(a−b)(a 2 +b 2 +AB) So, 3 − x 3
=(x− x 1
)(x 2 + x 2
1
+x× x 1
) =(x− x 1
)(x 2 + x 2
1
+1) =(x− x 1
)(51+1) =52(x− x 1
) Now, (x− x 1
) 2 =x 2 + x 2
1
−2x× x 1 2 =51−2=49 x− x 1
= 49
=7 Therefore, x 3 − x 3
1
=52(x− x 1
) =52×7 =364 Explanation: Hope it helps me mark me BRANLIST |
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