Q. Which value for the constant c makes z=2 an extraneous solution in the following equation?7−3z=3+czc=
Given Equation: We are given the equation 7−3z=3+cz and we need to find the value of c that makes z=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 c, we will substitute z=2 into the equation and solve for c.
Substitute z=2: Substitute z=2 into the equation 7−3z=3+cz. Equation becomes: 7−3(2)=3+c(2)
Simplify the Equation: Simplify the equation by performing the operation inside the square root and the multiplication by c.Equation becomes: 7−6=3+2cWhich simplifies to: 1=3+2c
Isolate c: Since 1 is 1, the equation simplifies to:1=3+2c
Divide by 2: To solve for c, we need to isolate c on one side of the equation. We do this by subtracting 3 from both sides of the equation.1−3=3+2c−3Which simplifies to: −2=2c
Verify Extraneous Solution: Now, divide both sides of the equation by 2 to solve for c.−22=22cWhich simplifies to: −1=c
Substitute c=−1 and z=2: We have found that c must be −1 for z=2 to be an extraneous solution to the equation 7−3z=3+cz. However, we need to check if z=2 is indeed an extraneous solution by substituting c=−1 and z=2 back into the original equation and verifying if it does not hold true.
Simplify Right Side: Substitute c=−1 and z=2 into the original equation 7−3z=3+cz. Equation becomes: 7−3(2)=3+(−1)(2) Which simplifies to: 1=3−2
Verify Equation: Simplify the right side of the equation: 1=1 Since 1 is also 1, the equation holds true, which means that z=2 is not an extraneous solution for c=−1. This contradicts our initial assumption, indicating a mistake in our reasoning. We were supposed to find a value of c that makes z=2 an extraneous solution, but instead, we found a value of c that makes z=2 a valid solution. Therefore, there is a math error in our reasoning process.