Question #183898

Find the area bounded by the curve x²=y+2 and the line x+y=0.


1
Expert's answer
2021-04-26T02:03:52-0400

Let us find the x points of intersection of two graphs y1(x)=x22y_1(x) = x^2 - 2 and y2(x)=xy_2(x) = - x by solving corresponding quadratic equation x22=xx^2 - 2 = -x. It has roots x=2,x=1x = -2 , x = 1.

Hence, the area between two curves is:

S=21(x(x22))dx=(x22x33+2x)21=92S = \int_{-2}^1 (-x - (x^2 - 2 )) d x = (-\frac{x^2}{2} - \frac{x^3}{3} + 2 x)|_{-2}^1 = \frac{9}{2}.


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