exam Maths Puzzle Numerical Ability

Solve by factoring.
4x^2 - 1 = 0

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exam Other Question

twice the sum of a number and 3 is the same as 1 subtracted from the number. Find the number Find the LCD,ans convert the expression into an equivalent rationalexpression with the LCD as the denominator.
(3)/4b^2-9, (2b)/2b+3, (-5)/2b^2-3b