exam Maths Puzzle Numerical Ability

Find the LCD for the given rational expression, and convert the rational expression into an equivalent rational expression with the LCD as the denominator.

3/4b^2-9, 2b/2b+3, -

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exam Other Question
I am having a problem solving this problem:

Is the square root of x^2 =x an identity (true for all values of x)?
Thanks for your time. (6+4i) - (-3+i)