book Maths Puzzle Numerical Ability

Solve where x is a real number.

square root of x + 4 = 1 + square root of x - 1

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book Other Question

If one root of the equation 2x2 + 3x � k = 0 is 6, what is the value of k?
(A) 90
(B) 42
(C) 18
(D) 10
(E) �10 1.A pendulum swings through an arc of 660 centimeters. On each successive swing, the length of the arc is 6/7 of the previous length. Find th total distance the pendulum travels before it comes to rest.