Find the coordinates of the points of intersection of the curve x+3=2xyx + 3 = 2xy and the curve y=2xy = \frac{2}{\sqrt{x}}.

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Worked solution

11

1. Substitute the expression for $y$ from the second equation into the first equation.

Substitute y=2xy = \frac{2}{\sqrt{x}} into x+3=2xyx + 3 = 2xy:
x+3=2x(2x)x + 3 = 2x\left(\frac{2}{\sqrt{x}}\right)

2. Simplify the equation to form a quadratic equation in terms of $\sqrt{x}$.

x+3=4xx + 3 = 4\sqrt{x}
x−4x+3=0x - 4\sqrt{x} + 3 = 0

3. Solve the quadratic equation for $\sqrt{x}$.

Let u=xu = \sqrt{x}. Then u2=xu^2 = x.
u2−4u+3=0u^2 - 4u + 3 = 0
(u−1)(u−3)=0(u - 1)(u - 3) = 0
u=1oru=3u = 1 \quad \text{or} \quad u = 3
x=1orx=3\sqrt{x} = 1 \quad \text{or} \quad \sqrt{x} = 3

4. Find the values of $x$.

x=12=1orx=32=9x = 1^2 = 1 \quad \text{or} \quad x = 3^2 = 9

5. Find the corresponding values of $y$ and state the coordinates.

When x=1x = 1, y=21=2y = \frac{2}{\sqrt{1}} = 2.
When x=9x = 9, y=29=23y = \frac{2}{\sqrt{9}} = \frac{2}{3}.

The coordinates of the points of intersection are (1,2)(1, 2) and (9,23)\left(9, \frac{2}{3}\right).

Answer

(1,2)(1, 2) and (9,23)\left(9, \frac{2}{3}\right)

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