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4x²-24x+36 = 2x²-4x+4
4x²-2x²-24x+4x+36-4
2x²-20x+32
x²-10x+16
(x-2)(x-8)
x=2 atau x=8
ambil x=8
luas∆ = ½(x)(x-2) = ½(8)(8-2) = 24