exam Maths Puzzle Numerical Ability

8. Factoring is very hard for me. How do I complete this one?

15x^2 + 7x - 2

thank you for your help.

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exam Other Question
what is a linear function; what does y=x look like on a graph I am totally lost on this two question and need some help.
Solve and check the following eqaution for x:
x/x-5+2=5/x-5

and

5/x+6+2/x^2+7x+6=3/x+1 Thank you