exam Maths Puzzle Numerical Ability

How Do You Fully Factorise y squared-7x+10?
I Have Gotten As Far As y squared -5x-2x+10

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Could I have some help with understanding this equation & how to solve it, from a homework sheet. Thank you. If f(x)=2x3-3x+1,find f(3). this is a word problem
20 less than twice a number is equal to the number. What is the number?