exam Maths Puzzle Numerical Ability

Please help me with square root. I must see how it is done. I have more to do.

sqrt7(2sqrt3+3sqrt7)

Many thanks

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exam Other Question

Using the formula pH = -log[H+], show me how to find the hydrogen ion content of coffee when the pH level is 5.0
Write answer in scientific notation including units. This question is from a quiz. You must show all relevant steps, list all numbers for which the rational expression is undefined.

x^2+6x-27
___________
x^2+x-6
Thank you