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x = -5/2 V x= -1/3
2. 2x²+6x-20 = 2(2x+10)(2x-4)=(x+5)(2x-4)
x= -5 V x=4/2=2
3. 4x²+11-3= 4(4x+12)(4x-1)= (x+3)(4x-1)
x= -3 V x= 1/4
koreksi dulu ya ^^