exam Maths Puzzle Numerical Ability

How many positive real numbers are there in:

f(x) = x^4 - 4x^3 + 6x^2 - 4x + 1

a. 1 or 0
b. 2 or 0
c. 4 or 2
d. 2 or 0

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exam Other Question

Hi I am having a test soon and I need help on solving application "word" problems of Linear Systems in Algebra. Can you help me or give me extra problems to try or special websites I need to write an equation in slope intercept form for a line that is perpendicular to the line whose equation is 3x-2y=4 and has the same y intercept as this line.

Thanks