Solve this PLZ!
4 - 7 (v - 9) = -7 -6(v - 10)

△cde maps to △stu with the transformations (x, y) arrowright (x − 2, y − 2) arrowright (3x, 3y) arrowright (x, −y). if cd = a + 1, de = 2a − 1, st = 2b + 3 and tu = b + 6, find the values of a and b. the value of a is and the value of b is .

Common binomial factor of 6x(3x+7)+5(3x+7)

State one method by which you can recognize a perfect square trinomial.