exam Maths Puzzle Numerical Ability

How many positive real solutions are there in:

f(x) = -2x^4 + 3x^3 + 7x^2 + 2

a. 0
b. 2
c. 1
d. None, there is no x-term

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exam Other Question

I need a little help with these 2 problems in putting them in rational form.
-3(x + 5)+3=12 and 2/3x + 1/6x=2 find a quadratic function with vertex (4,-5) and containing the point (-3,1). Give you solution in the form f(x)=a(x-h)^2+k