Poinnya 75. tolong kerjain tiga soal ini
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-x²+5x-1-3=0
-x²+5x-4=0
(-x+1)(x-4)
x=1 ; x=4
2.) x²-3x+1=4x+9
x²-3x-4x+1-9=0
x²-7x-8=0
(x+1)(x-8)
x= -1; x=8
3.)4x-3*2(3-2x)=30
4x-3*6-4x=30
-16x-18=30
-16x=48
x= -3
cek lagi,,
semoga dapat membantu.