f(x)=a(x+p)^2+k

a = 2 (slider from -5 to 5, step 0.1)
p = -1.5 (slider from -5 to 5, step 0.1)
k = 0.6 (slider from -5 to 5, step 0.1)
f(x) = a * (x + p)^(2) + k
text2: "f(x) = " + f