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Waec 1999 Mathematics Past QuestionsQuestion 16:If \(y = \sqrt{ax-b}\) express x in terms of y, a and b A. \(x = \frac{y^2-b}{a}\) B. \(x = \frac{y+b}{a}\) C. \(x = \frac{y-b}{a}\) D. \(x = \frac{y^2 + b}{a}\) Question 17:Given that \(81\times 2^{2n-2} = K, find \sqrt{K}\) A. \(4.5\times 2^{n}\) B. \(4.5\times 2^{2n}\) C. \(9\times 2^{n-1}\) D. \(9\times 2^{2n}\) Question 18:Simplify \(\frac{4}{x+1}-\frac{3}{x-1}\) A. \(\frac{x+7}{x^2 - 1}\) B. \(\frac{x-7}{x^2 + 1}\) C. \(\frac{x-7}{x^2 - 1}\) D. \(\frac{x-11}{x^2 - 1}\) Question 19:If y varies inversely as x\(^2\), how does x vary with y? A. X varies inversely as y2 B. X varies inversely as y C. X varies directly as y2 D. X varies directly as y Question 20:If \(tan x = \frac{1}{\sqrt{3}}\), find cos x - sin x such that \(0^o \leq x \leq 90^o\) A. \(\frac{\sqrt{3}+1}{2}\) B. \(\frac{2}{\sqrt{3}+1}\) C. \(\frac{\sqrt{3}-1}{2}\) D. \(\frac{2}{\sqrt{3}-1}\) |
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