book Maths Puzzle Numerical Ability

What is a constant?

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book Other Question

I need help with this problem. I know that I am suppose to multiple both sides with the square root.

Simplify square root of x+1 + 1 over the square root of x + 1
i am having trouble with this partial fraction equation.

i can find B but not the A part of the formula because oif the 2x+1 part.

(-3)/(2x+1)(x-3)

-3=A(x-3)B(2x+1)