which of the following expression are perfect square trinomials?write pst if it is and not if not
3) x² + 16x +16
4) 9y² - 18y + 9
5) 9y² + 18y + 9
6) 16a² - 36a +81
7) 16a² - 72a + 81
8) 36b² + 12b + 1
9) 25a² - 10a + 4
10) 9y² + 6a + 1

B factor each expression
1) 4x² - 12x + 9
2) x² - 6x + 9
3) x² +10x + 25
4) 9x² - 12x + 4
5) 49x² + 14x + 1

i am very thankful u answered this i really need the answers fast​