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K(x)=x2 +1, g(y)=y2 -1, Find k(4) – g(4)?

I guess it is k(x) = x^2 + 1

and g(y) = y^2 - 1

We use "^" for an exponent.

To find k(4) just replace x by 4 in the equation.

k(4) = 4^2 + 1

k(4) = 16 + 1

k(4) = 17

Do the same for g(4) :

g(4) = 4^2 - 1

g(4) = 16 - 1

g(4) = 15

k(4) - g(4) = 17 - 15 = 2