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# y^3 = 4x^2

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y^3 = 4x^2

If x is doubled, by what factor does y increase?

Guest Jan 20, 2016

### Best Answer

#2
+18829
+10

y^3 = 4x^2

If x is doubled, by what factor does y increase?

$$\begin{array}{lcll} \boxed{~ \begin{array}{lcll} y^3 &=& 4\cdot x^2 \end{array} ~} \end{array}\\ \begin{array}{rcll} \\ (y\cdot f)^3 &=& 4\cdot (2x)^2 \\ y^3\cdot f^3 &=& 4\cdot 4 \cdot x^2 \qquad & | \qquad 4 \cdot x^2 = y^3\\ y^3\cdot f^3 &=& 4\cdot y^3\\ f^3 &=& 4\\ \mathbf{f} &\mathbf{=}& \mathbf{\sqrt[3]{4}}\\ \end{array}\\$$

heureka  Jan 20, 2016
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### 2+0 Answers

#1
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.................................................

CPhill  Jan 20, 2016
edited by CPhill  Jan 20, 2016
#2
+18829
+10
Best Answer

y^3 = 4x^2

If x is doubled, by what factor does y increase?

$$\begin{array}{lcll} \boxed{~ \begin{array}{lcll} y^3 &=& 4\cdot x^2 \end{array} ~} \end{array}\\ \begin{array}{rcll} \\ (y\cdot f)^3 &=& 4\cdot (2x)^2 \\ y^3\cdot f^3 &=& 4\cdot 4 \cdot x^2 \qquad & | \qquad 4 \cdot x^2 = y^3\\ y^3\cdot f^3 &=& 4\cdot y^3\\ f^3 &=& 4\\ \mathbf{f} &\mathbf{=}& \mathbf{\sqrt[3]{4}}\\ \end{array}\\$$

heureka  Jan 20, 2016

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