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48-24-16x-12x+4x²=0
24-28x+4x²=0 , 4x²-28x+24=0
Δ=b²-4ac
Δ=784-4*4*24= 784-384=400 / √=20
x1= -b-√Δ :2a
x1= 28-20 : 8= 8:8= 1
x2= -b+√Δ: 2a
x2=28+20 : 8 = 48:8 = 6
x1=1, x2= 6