exam Maths Puzzle Numerical Ability

solve and check

80=10x

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exam Other Question

How many three digit numbers can be formed using the digits 1,2,3,4,5,6 and 7 if no digit can be replaced in a number? I have a slight Idea on how to do this but I get stuck every evaluate the function for the value specified.

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

I am really confused on this one. Thanks