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The value of (x>1),for which the sixth term in the expansion of { 2log2√ (9^(x-1)+7) + 1/2(1/5)log2(3^(x-1) +1) }7 is 84 is equal to
E.g: 9876543210, 01112345678
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Syllabus
The value of (x>1),for which the sixth term in the expansion of
{ 2log2√ (9^(x-1)+7) + 1/2(1/5)log2(3^(x-1) +1) }7 is 84 is equal to
X2001+[1/2-X]2001=0 is ???
1: 2000
2: 2001
3: 1000
4: 500
Above is question and its solution. I didn't get the first step itself. Explain in detail