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1. Which mathematical expression is a perfect square trinomial? 

A. 6x2 – 5xy + y2
B. 6x2 +13x – 28
C. 16x2 –40x + 25
D. 4x2 + 20x + 25

2. Which of the following DOES NOT belong to the group?

A. 1 4 x4 – 1
B. x2 – 0.0001y4
C. 6x2 +13x – 28
D. 4x2 + 20x + 25​