Further MathematicsSurds, indices and logarithmsWAEC
Solve the equation 2²ˣ − 5(2ˣ) + 4 = 0.
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Answer: D. x = 0 or x = 2
Let y = 2ˣ: y² − 5y + 4 = 0 gives y = 1 or 4, so x = 0 or 2.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.