4y2 – 25 (x
+ y)2
16 x2 + 16xy + 4y2 (5 – 2y)2
4x2 – 12xy + 9y2 (2y
– 5)(2y + 5)
x2 + 2xy + y2 (4x
+ 2y)2
4y2 – 20y + 25 (2x
– 3y)2
a)
3x = -12
b)
–6y = 0
c)
13 – 7y = 4y
– 90
d)
4x – 5 – 5x
= 8 – 6x – 13
a) 2x – 8 < 4x + 2
b)
6 – 3x
x – 4
c) 12 – x > 8 – x
d) 5x – 2 > 5 + 5x