book Maths Puzzle Numerical Ability

How do i simplify a radical like this...?

3 radical sign 5 = radical sign n
Thank you again

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book Other Question

solve the equation graphically if possible.
x=4+y
y=3+x
thank you
kayla
The area of a rectangle of length x is given by 3x^2 + 5x. Find the width of the rectangle.

Thank you!