Simplify the following expressions: a) 4a - 2a - 5a + a b) 6p - 3q + p - 7q c) 2√7 + 8 - 2 + 5√7 2....

1. Simplify the following expressions:
a) 4a - 2a - 5a + a
b) 6p - 3q + p - 7q
c) 2√7 + 8 - 2 + 5√7
2. Simplify the following expressions:
a) -3m x 2n x 4
b) -3(2r - 11)
c) 5x(x - 7y)
3. Show that 3(x + 4) - 6(3 - 2x) = 15x - 6.
4. Expand and simplify:
a) (x + 3)(x - 6)
b) (5a + 2)(a - 4)
c) (x + 8)^2
d) (2y - 3)^2
5. Factorise the following expressions:
a) 3x - 9
b) 4y + 20y^2
c) x^2 - 16
d) 16x^2 - 25y^2