exam Maths Puzzle Numerical Ability

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).

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exam Other Question

Could you check my answer please?

An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid?

128/800 16
How Do You Fully Factorise y squared-7x+10?
I Have Gotten As Far As y squared -5x-2x+10