exam Maths Puzzle Numerical Ability

If the discriminat is negative, would this be a true statement?

The discriminant is negative, so the quadratic has no real-valued zeroes and therefore no solution.

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exam Other Question

Would someone please help with this problem?
The function f(x) = x^4-x^3-7x^2+5x+10.
My answer options are:
A. has two rational roots and no irrational roots
B. has two rationa
please help me with this I really do not understand what to do.
if f(x)=5x-1 find the following,
f(-2)