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How do I find the area under a function given the X and Y limits and equation?

Precalculus f(x) = x + 4, f(x)=0, x = 2, x = 10

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Ann K. | Science, Algebra I, Spanish, English, ESL, and GED Tutor Houston, TXScience, Algebra I, Spanish, English, ES...
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Find the domain of the composite function  f o g.
 
f(x)=           5               g(x)=     x + 5
             ---------- ,  
               x + 7
John R. | Physics and Math Tutor – Kind, Easy-going, PatientPhysics and Math Tutor – Kind, Easy-goin...
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Since f(x) = 0, this is just the x axis, so this is the definite integral evaluated between the limits x = 2 and x = 10.

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One of the best ways to approach this problem is a graphical approach: First plot the four lines ( y = x + 4, y=0, x = 2, and x = 10). You find that this encompasses a region that can be described as a combination of a rectangle and a triangle. From here you can use your knowledge of geometry to compute the area of each of these shapes and add them for the result.

Steven W. | Math can be fun! Experienced tutor in Algebra, Calculus, GeometryMath can be fun! Experienced tutor in Al...
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John, this is a precalculus question. There's no discussion or even awareness of integration nor of definite integral s at that level.

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Thanks Steven, I keep this in mind in the future.