yes, (7x - 4)2
7x + 9 = 6x + 17 7x - 6x = 17 -9 x = 8
-7x + 6 + 7x - 2 = 4
49x2 - 56x + 16 = (7x - 4)2 so yes, it can be a perfect square.
20 + 7x
(7x - 4)(7x + 4).
(3b + 7x)(3b + 7x) or (3b + 7x)2
8y-7x
x2+7x+12
7x-2
The given expression can be simplified to: 7x+4y
7x+20-15=7x+5