Area of Rectangle: Calculating with x=1.0 & x=1.5

[needOfHelpCMath]

I know that the height is not 2 somewhere around 1.9 or 1.85 which is the f()
It is x = 1.0 and x = 1.5
and the strip of the shaded is 0.5 unit wide

Somehow i can get the asnwerView attachment 6312

 

[MarkFL]

It appears the base $b$ of the rectangle is 0.5 units, while the height is:

\(\displaystyle h=f(1.5)=4-1.5^2=1.75\)

Thus, the area $A$ (in units squared) is:

\(\displaystyle A=0.5\cdot1.75=0.875\)

 

[needOfHelpCMath]

It appears the base $b$ of the rectangle is 0.5 units, while the height is:

\(\displaystyle h=f(1.5)=4-1.5^2=1.75\)

Thus, the area $A$ (in units squared) is:

\(\displaystyle A=0.5\cdot1.75=0.875\)

ahaha the height does not seem to be 1.5 ahaha..thank you :D