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= 2x².4x² + (-3xy).4x² + 4y².4x²
= 8x^4 - 12 ^3y + 16x²y²
2) (2x-3).(x-6)
= 2x.x + 2x.(-6) + (-3).x + (-3).(-6)
= 2x² - 12x - 3x + 18
= 2x² - 15x + 18