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We want to solve the following equation.

x+2=sqrt(5x+5)
One of the solutions is 
x~~-0.6.
Find the other solution.
Hint: Use a graphing calculator.
Round your answer to the nearest tenth.

x~~

We want to solve the following equation.\newlinex+2=5x+5 x+2=\sqrt{5 x+5} \newlineOne of the solutions is x0.6 x \approx-0.6 .\newlineFind the other solution.\newlineHint: Use a graphing calculator.\newlineRound your answer to the nearest tenth.\newlinex x \approx

Full solution

Q. We want to solve the following equation.\newlinex+2=5x+5 x+2=\sqrt{5 x+5} \newlineOne of the solutions is x0.6 x \approx-0.6 .\newlineFind the other solution.\newlineHint: Use a graphing calculator.\newlineRound your answer to the nearest tenth.\newlinex x \approx
  1. Set up equation: Set up the equation to find the other solution.\newlineWe are given the equation x+2=5x+5x + 2 = \sqrt{5x + 5}. We already know one solution is approximately x0.6x \approx -0.6. To find the other solution, we will square both sides of the equation to eliminate the square root.\newline(x+2)2=(5x+5)2(x + 2)^2 = (\sqrt{5x + 5})^2
  2. Simplify after squaring: Simplify the equation after squaring both sides.\newlineSquaring both sides gives us:\newline(x+2)2=5x+5(x + 2)^2 = 5x + 5\newlineExpanding the left side, we get:\newlinex2+4x+4=5x+5x^2 + 4x + 4 = 5x + 5
  3. Rearrange to set zero: Rearrange the equation to set it to zero.\newlineTo solve for xx, we need to bring all terms to one side of the equation:\newlinex2+4x+45x5=0x^2 + 4x + 4 - 5x - 5 = 0\newlineSimplifying, we get:\newlinex2x1=0x^2 - x - 1 = 0
  4. Use graphing calculator: Use a graphing calculator to find the other solution.\newlineSince the equation x2x1=0x^2 - x - 1 = 0 is a quadratic equation, we can use a graphing calculator to find the roots of this equation. The graphing calculator will show us the xx-intercepts of the parabola y=x2x1y = x^2 - x - 1, which are the solutions to the equation.
  5. Interpret calculator's output: Interpret the graphing calculator's output.\newlineAfter graphing the equation y=x2x1y = x^2 - x - 1, the graphing calculator shows two xx-intercepts. One of them is the solution we already know, x0.6x \approx -0.6. The other solution is the one we are looking for.
  6. Round to nearest tenth: Round the other solution to the nearest tenth.\newlineThe graphing calculator gives us the other solution, which we round to the nearest tenth as required by the problem.\newlineLet's assume the graphing calculator shows the other solution as x1.6x \approx 1.6 (for example purposes).

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