(x+6)^2 = x^2 + 26x + 6^2 = x^2 + 12x + 36
(3a-1)^2 = (3a)^2 - 23a1 + 1 = 9a^2 - 6a + 1
(3y-2)(3y+2) = 9y^2 - 4
(4a+3k)(4a-3k) = 16a^2 - 9k^2
(b-8)^2 = b^2 - 28b + 8^2 = b^2 - 16b + 64
-(64-6b) = 6b - 64
25-y^2 = (5-y)(5+y) = (5-y)(y+5) = - (y-5)(y+5) = - (y^2 - 25) = -y^2 + 25
a^2 - 6ab + 9b^2 = (a-3b)^2
(x+6)^2 = x^2 + 26x + 6^2 = x^2 + 12x + 36
(3a-1)^2 = (3a)^2 - 23a1 + 1 = 9a^2 - 6a + 1
(3y-2)(3y+2) = 9y^2 - 4
(4a+3k)(4a-3k) = 16a^2 - 9k^2
(b-8)^2 = b^2 - 28b + 8^2 = b^2 - 16b + 64
-(64-6b) = 6b - 64
25-y^2 = (5-y)(5+y) = (5-y)(y+5) = - (y-5)(y+5) = - (y^2 - 25) = -y^2 + 25
a^2 - 6ab + 9b^2 = (a-3b)^2