If f(x)=2x^2+5√(x+2) then:
f(2)=2(2^2)+5√(2+2)
f(2)=2(4)+5√4
f(2)=8+5(2)
f(2)=8+10
f(2)=18
We assume the square root is positive unless otherwise indicated because this is a function and you can have only one y value for each x value to be a function.