exam Maths Puzzle Numerical Ability

How do you solve something like this:

14x-28x^2

how do i solve if the bigger number is negative?
Does the answer become 14x(-2x+1)?

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exam Other Question

The degree three polynomial f(x) with real coefficients and leading coefficient 1, has 4 and 3 + i among its roots. Express f(x) as a product of linear and quadratic polynomials w how do you find range and domain?