how to find unsigned area

[noideahowtousehpprimeg2]

how would i find the unsigned area of 2 graphs or total area
y= (1/8)(x^3)+(1/4)(x^2)-(5/2)(x)+1
y=0.5x+1

[Albert Chan]

Cas> f := (x^3/8 + x^2/4- 5x/2 + 1) - (x/2+1)
Cas> zeros(f)                            --> [0,4,-6]
Cas> int(f,x,-6,0),int(f,x,0,4)      --> [63/2, -32/3]
Cas> sum(abs(Ans))                  --> 253/6

[noideahowtousehpprimeg2]

I understand ur setting the function to f, but which button on calculator do u use for that?