Let m=2x+3m=2x+3m, equals, 2, x, plus, 3.
Which equation is equivalent to (2x+3)^2-14x-21=-6(2x+3)
2
−14x−21=−6left parenthesis, 2, x, plus, 3, right parenthesis, squared, minus, 14, x, minus, 21, equals, minus, 6 in terms of mmm ?

Cbecause they are equal so that means it is the same on both sides? ! hope this

If two sides of a triangle are congruent, then the angles opposite those sides are congruent. the converse of the base angles theorem, states that if two angles of a triangle are congruent, then sides opposite those angles are congruent.