exam Maths Puzzle Numerical Ability

Mulitply (x-5)(x-4)

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exam Other Question

Evaluate each function for the value specified.

f(x)=x^2-7x+10; find (a)f(0), (b)f(5), and (c)f(-2).

Can you please help with this problem, I am really lost when it comes to this.
7f=-38-5e
5e+3f-23