Congruent triangle measures.​

3x=4x-9(By CPCT)

x=9

Therefore,sides are27

Given:

Given that Mrs. Galicia’s solution for the equation.

We need to determine whether Mrs. Galicia’s solution is correct or not.

Also, we need to determine the correct solutions.

Mrs. Galicia’s solution:

Step 4:

Step 5:

After step 4, Mrs. Galicia’s did not take square root on both sides to determine the value of x.

Thus, Mrs. Galicia’s made in mistake in step 5, by solving the equation without taking square root on both sides.

Hence, Mrs. Galicia’s solution is wrong.

Correct solutions:

The equation is

Solving, we get;

Completing the square, we have;

Taking square root on both sides, we get;

Thus, the values of x are given by

and

      and      

Thus, the correct solutions are x = 9 and x = -1