a. (5 - x )² =
(5 - x) * (5 - x)
25 -5 x - 5 x + x²
x² - 10 x + 25
c. (x-y)² =
(x-y).(x-y) =
x² -2xy + y²
e. 2x-5)²=
2x²-2.2x.5+5²=
4x²-20x+25
g. (3x - 2y)=
(3−2).(3−2)=
3(3−2)−2(3−2)
92−6−2(3−2)
92−6−6+42
92−12+42
