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12a²b = 2² x 3 x a² x b²
KPK = 2⁴ x 3 x a² b² = 48a²b²
2. 2p = 2.(-1) = -2
3. (p+5)/3p - 2/3p = (p+3)/3p = ((-1)+3)/3(-1) = 2/-3 = -2/3
4. (3/2)² = 9/4
5. (3x+5)² = 9x²+15x+15x+25 = 9x²+30x+25