I’m still confused if i still got it right?

the answer is √205 which you have done correctly in part b.

in part a, the error in your work comes from having the y-axis part of the triangle incorrectly labeled with a distance of 5. the vertical distance between points (-6,-2) and (7,-8) is not 5; it is 6. count the tickmarks between -8 and -2 on the y-axis and you will get 6.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!