exam Maths Puzzle Numerical Ability

Express in simplest form with rationalized denominators: sqrt 7 - sqrt 5 / sqrt 5 + 3 sqrt 7

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I need help with this question and I have no clue how to even attempt it: graph the function f(x)=(x+3)^3+4. Can somebody help me? How do I find the equation of the line that contains the points (2,3) and (4,7)?