John sees the expression x^2+3x-5. He decides to substitute 7 for the first x and 2 for the second x. What axiom has he violated?

Complete each statement from the information given and the triangle criterion you used. if the triangles cannot be shown to be congruent, leave the box for the second triangle blank and choose for reason “cannot be determined.” carbon - regular hexagon. ∆can ≅ ∆ by