Two parabolas are given by , and . Find the area bounded by the two curves.
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Let us first check where the two parabolas intersect. When they intersect, we have:
1 6 ( x − 3 ) 2 + 5 1 6 x 2 − 6 x + 8 9 x 2 − 6 x + 8 9 7 x 2 − 7 4 x + 1 2 7 ⟹ x = 2 ( x − 5 ) 2 + 1 = 2 x 2 − 1 0 x + 2 7 = 8 x 2 − 8 0 x + 2 1 6 = 0 = 7 3 7 ± 4 3 0
Then the area bounded by the two parabolas is
A = ∫ 7 3 7 − 4 3 0 7 3 7 + 4 3 0 ( 1 6 ( x − 3 ) 2 + 5 − 2 ( x − 5 ) 2 − 1 ) d x = 1 6 1 ∫ 7 3 7 + 4 3 0 7 3 7 − 4 3 0 ( 7 x 2 − 7 4 x + 1 2 7 ) d x = 1 6 1 [ 3 7 x 3 − 3 7 x 2 + 1 2 7 x ] 7 3 7 + 4 3 0 7 3 7 − 4 3 0 ≈ 1 7 . 9