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b. 8x
c. -24p
3. a. 18a - 5 (a-3b)
= 18a - 5a + 15b
b. 12 + 2(4x-3)
= 12 + 8x -6
c. 8 (3x+4y) - 5 (4x-6y)
=24x + 32y -20x + 30y
=4x + 62y
4. a. (5a+8) +(8a+3)
=5a +8a +8 +3
=13a +11
b. 6p - 5q -2r + (-8p+6q+9r)
= 6p - 5q -2r -8p +6q +9r
= 6p -8p -5q +6q -2r +9r
=-2p +q +7r
c. 8x^2 +4x -21 + (6x^2 -11x +7 -17x +24)
= 8x^2 +4x -21 +6x^2 -11x +7 -17x +24
= 8x^2 +6x^2 +4x -11x -21 +24
= 14x^2 -7x +3
5. a. 8a +12 - (7a+14)
= 8a +12 - 7a -14
=8a - 7a +12 -14
=a-2
b. 11x^2 -17x +24 - (2x^2+15x -18)
=11x^2 - 17x +24 -2x^2 -15x +18
=11x^2 -2x^2 -17x -15x +24 +18
=9x^2 - 32x + 42
c. 15p +18q -17 -(12p -7q +6)
= 15p +18q -17 -12p + 7q -6
= 15p -12p +18q +7q -17 -6
= 3p + 25q -23
maap kalo salah (: