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coret bilangan pokok.
x²-3x = x+8
x²-3x-x = 8
x²-4x = 8 .... cari akar2 dgn melengkapi fungsi.
x²-4x+2² = 8+2²
(x-2)² = 12
x-2 = √12 atau x-2 = -√12
x₁ = 2+√12 atau x₂ = 2 - √12
= 2+ 2√3 = 2 - 2√3
note : jika soal yang dimasud spt itu.