Bonjour,
I = 2(6y-5)²-12+10y = 2(36y²-60y+25)-12+10y
= 72y²-120y+10y+50-12
= 72y²-110y+38
J = (1+9x)(1-9x)+(3x+7)² = 1-81x²+9x²+42x+49
= -72x²+42x+50
K = 6x²-18-(x-4)² = 6x²-18-(x²-8x+16)
= 5x²+8x-34
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Bonjour,
I = 2(6y-5)²-12+10y = 2(36y²-60y+25)-12+10y
= 72y²-120y+10y+50-12
= 72y²-110y+38
J = (1+9x)(1-9x)+(3x+7)² = 1-81x²+9x²+42x+49
= -72x²+42x+50
K = 6x²-18-(x-4)² = 6x²-18-(x²-8x+16)
= 5x²+8x-34