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Which value for the constant 
c makes 
z=2 an extraneous solution in the following equation?

{:[sqrt(7-3z)=3+cz],[c=]:}

Which value for the constant c c makes z=2 z=2 an extraneous solution in the following equation?\newline73z=3+czc= \begin{array}{l} \sqrt{7-3 z}=3+c z \\ c= \end{array}

Full solution

Q. Which value for the constant c c makes z=2 z=2 an extraneous solution in the following equation?\newline73z=3+czc= \begin{array}{l} \sqrt{7-3 z}=3+c z \\ c= \end{array}
  1. Given Equation: We are given the equation 73z=3+cz\sqrt{7-3z} = 3 + cz and we need to find the value of cc that makes z=2z=2 an extraneous solution. An extraneous solution is a solution that is derived from an algebraic manipulation but is not a solution to the original equation. To find the value of cc, we will substitute z=2z=2 into the equation and solve for cc.
  2. Substitute z=2z=2: Substitute z=2z=2 into the equation 73z=3+cz\sqrt{7-3z} = 3 + cz. Equation becomes: 73(2)=3+c(2)\sqrt{7-3(2)} = 3 + c(2)
  3. Simplify the Equation: Simplify the equation by performing the operation inside the square root and the multiplication by cc.\newlineEquation becomes: 76=3+2c\sqrt{7-6} = 3 + 2c\newlineWhich simplifies to: 1=3+2c\sqrt{1} = 3 + 2c
  4. Isolate cc: Since 1\sqrt{1} is 11, the equation simplifies to:\newline1=3+2c1 = 3 + 2c
  5. Divide by 22: To solve for cc, we need to isolate cc on one side of the equation. We do this by subtracting 33 from both sides of the equation.\newline13=3+2c31 - 3 = 3 + 2c - 3\newlineWhich simplifies to: 2=2c-2 = 2c
  6. Verify Extraneous Solution: Now, divide both sides of the equation by 22 to solve for cc.22=2c2-\frac{2}{2} = \frac{2c}{2}Which simplifies to: 1=c-1 = c
  7. Substitute c=1c=-1 and z=2z=2: We have found that cc must be 1-1 for z=2z=2 to be an extraneous solution to the equation 73z=3+cz\sqrt{7-3z} = 3 + cz. However, we need to check if z=2z=2 is indeed an extraneous solution by substituting c=1c=-1 and z=2z=2 back into the original equation and verifying if it does not hold true.
  8. Simplify Right Side: Substitute c=1c=-1 and z=2z=2 into the original equation 73z=3+cz\sqrt{7-3z} = 3 + cz. Equation becomes: 73(2)=3+(1)(2)\sqrt{7-3(2)} = 3 + (-1)(2) Which simplifies to: 1=32\sqrt{1} = 3 - 2
  9. Verify Equation: Simplify the right side of the equation: 1=1\sqrt{1} = 1 Since 1\sqrt{1} is also 11, the equation holds true, which means that z=2z=2 is not an extraneous solution for c=1c=-1. This contradicts our initial assumption, indicating a mistake in our reasoning. We were supposed to find a value of cc that makes z=2z=2 an extraneous solution, but instead, we found a value of cc that makes z=2z=2 a valid solution. Therefore, there is a math error in our reasoning process.

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