You can use this to help you to find the answer
Answer:
(z-6)(z+3)
Step-by-step explanation:
Both of the other angles are 40° because a triangle has a total angle of 180° and an isosceles triangle means that at least two of the sides have to be the same length (two angles must be the same)
180 - 100= 80
80 ÷ 2 = 40
