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Which value for the constant 
d makes 
y=7 an extraneous solution in the following equation?

{:[sqrt(4y-3)=d-y],[d=]:}

Which value for the constant d d makes y=7 y=7 an extraneous solution in the following equation?\newline4y3=dyd= \begin{array}{l} \sqrt{4 y-3}=d-y \\ d= \end{array}

Full solution

Q. Which value for the constant d d makes y=7 y=7 an extraneous solution in the following equation?\newline4y3=dyd= \begin{array}{l} \sqrt{4 y-3}=d-y \\ d= \end{array}
  1. Understanding extraneous solutions: Understand what an extraneous solution is. An extraneous solution is a solution that emerges from the process of solving an equation but is not a valid solution to the original equation. In this case, we want to find a value for dd such that y=7y=7 appears to be a solution after solving the equation but does not satisfy the original equation.
  2. Substituting y=7y=7 into the left side: Substitute y=7y=7 into the left side of the equation.\newlineWe substitute y=7y=7 into the equation 4y3\sqrt{4y-3} to see what value it produces.\newlineCalculation: 4×73=283=25=5\sqrt{4\times 7-3} = \sqrt{28-3} = \sqrt{25} = 5
  3. Substituting y=7y=7 into the right side: Substitute y=7y=7 into the right side of the equation.\newlineWe substitute y=7y=7 into the equation dyd-y to see what expression we get.\newlineExpression: d7d-7
  4. Setting the expressions equal: Set the expressions from Step 22 and Step 33 equal to each other.\newlineSince we want y=7y=7 to be an extraneous solution, the expressions from the left and right sides of the equation when y=7y=7 is substituted should not be equal.\newlineEquation: 5=d75 = d-7
  5. Solving for d: Solve for d.\newlineWe solve the equation from Step 44 for d.\newlineCalculation: d=5+7=12d = 5 + 7 = 12
  6. Verifying y=7y=7 as an extraneous solution: Verify that y=7y=7 is an extraneous solution for the found value of dd. We substitute d=12d=12 and y=7y=7 back into the original equation to check if it holds true. Original equation: 4y3=dy\sqrt{4y-3} = d-y Substitution: 4×73=127\sqrt{4\times 7-3} = 12-7 Verification: 25=5127=5\sqrt{25} = 5 \neq 12-7 = 5 Since the equation does not hold true, y=7y=7 is indeed an extraneous solution for d=12d=12.

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