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= (30:5).a^5-2
= 6a^3
2) (2x-3)² - (2x+3)²
= ((2x)² + 2.2x.(-3x) + (-3)²) - ((2x)² + 2.2x.3 + 3²)
= (4x²-12x+9) - (4x²+12x+9)
= 4x²-12x+9-4x²-12x-9
= 4x²-4x²-12x-12x+9-9
= -24x
3) x²+2x-48 = (x-6).(x+8)
30 a pangkat 4 : 5 a pangkat 2
= 30 : 5 = 6
= 4 - 2 =2
hasilnya 6 a kuadrat