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ICSE Class 9 Answered

Please solve this question 🙏
Asked by nishabr7 | 27 Sep, 2018, 08:03: PM
Expert Answer
8 × 22x + 4 × 2x + 1 = 1 + 2x
8 × 22x + 4 × 2x × 2 = 1 + 2x
Let 2x = m
8m2 + 8m = 1 + m
8m2 + 7m - 1 = 0
Solving this using factorisation we get
(m + 1)(8m - 1) = 0
m = -1 or m = 1/8
2x = -1 or 2x = 2-3 
As 2x ≠ -1 hence, 2x = 2-3 then x = -3
Answered by Sneha shidid | 28 Sep, 2018, 10:04: AM

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