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(6x-6)(x+1)
x=1 x=1
2. 3m²-243=0
(3m+81)(m-81)
m= 27 m=81
3.-18x²+3x+10
( pakai rumus abc
didapatkan x= -1/5 dan x=5/4
4. x²+8x+16=0
(x+4)(x+4)
x= -4 dan x= -4
5.x²+5/2x-1=0
pakai rumus abc