Is 7, 8, 13 a right triangle?

Find the vertex of the function given below y=x^2-6x+1

Look at attachment. has all info needed. need

Scenario: a rectangular plot of ground is 5 meters longer than it is wide. its area is 20,000 square meters. question: what equation will you find the dimensions? note: let w represent the width. options: w(w+5)=20,000 w^2=20,000+5 (w(w+5))/2=20,000 w+2(w+5)=20,000