Solve using appropriate property: 3/8 × -4/5 + 7/9 × 3/8 (-3/8 × 8/10)
2 answers:
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Answer:
V=258 πvu
Step-by-step explanation:
Knowing that to find the solid of revolution is V=πR²h, where R² = y = f(x) and h = a differential of x, we have that (according to the graph)
dV=π(4-32x)²dx, integrating on both sides ∫dV=π∫(4-32x)²dx;
let's solve ∫(4-32x)²dx = ∫(16-256x+1024x²)dx = 16∫dx-256∫xdx+1024∫x²dx =
16x-128x²+(1024/3)x³ evaluated between 0≤x≤1/8 plus 1/8∠x≤1, also
V=π/8(16.-128.+(1024/3))+π(16.1-128.1+(1024/3).1 = π/8(48-384+1024)/3+π(16.1-128.1+(1024/3).1 = π688/24+ π688/3 =
258 πvu
Note:
vu = volume units
Due to "inconvenience" to visualize graph 1 in its real scale its scale was modified in graph 2 and 3 respectively
