Jawapan

2015-09-04T22:18:12+08:00
2015-09-05T00:18:56+08:00
= p × p = p²
= p × 3 = 3p
= -4 × p = -4p
= -4 × 3 = -12

= p² + 3p  - 4p - 12
= p² + p - 12