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sertanlavr [38]
3 years ago
8

Y = 2x – 6 4x – 2y = 14 Use the substitution method.

Mathematics
1 answer:
gtnhenbr [62]3 years ago
6 0
This question is written out in correctly because using the substitution method you won’t be able to find value for X.

Explanation: 4x-2(2x-6)=14
4x-4x+12=14
X will be zero which is impossible
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Find the volume of revolution bounded by the curves y = 4 – x2 , y = x, and x = 0, and is revolved about the vertical axis.
aleksley [76]
4-x^2=x\\
x^2+x-4=0\\
\Delta=1^2-4\cdot1\cdot(-4)=1+16=17\\
x_1=\dfrac{-1-\sqrt{17}}{2}\\
x_2=\dfrac{-1+\sqrt{17}}{2}\\\\
\displaystyle
V=\pi\int\limits_0^{\dfrac{-1+\sqrt{17}}{2}}(4-x^2-x)^2\,dx\\
V=\pi\int\limits_0^{\dfrac{-1+\sqrt{17}}{2}}(16-4x^2-4x-4x^2+x^4+x^3-4x+x^3+x^2)\,dx\\
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V=\pi \left[\dfrac{x^5}{5}+\dfrac{x^4}{2}-\dfrac{7x^3}{3}-4x^2+16x\right]_0^{\dfrac{-1+\sqrt{17}}{2}}\\


The rest of solution in the attachment. 

There's a mistake in the picture
It shoud be
V=\pi\left(\dfrac{289\sqrt{17}-521}{60}\right)\approx35

7 0
3 years ago
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Read 2 more answers
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