Tìm x biết: x²+2x-3x-6=0
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Bài 19: Tìm x biết:
1) x²+2x-3x-6=0
4) x+20x-x-20=0
7) x² - 4x²-x+4=0
10) 2x² - 2x=(x-1)²
13) 3(x-6)² = 60-10x
16) 2(x-5)-x² +25=0
19) x² −4+ (x+2)(x-3)=
2) x²-8x+3x-24 = 0
5) x² +10x-2x-20=0
8) x²-3x² + 3x-1=0
11) (x-3)² +3 - x = 0
14) (x+3)² - 6x-18 = 0
17) x(x+1)-x² + 1 = 0
20) 2x (x-1)-(1-x)² = 0
3) x² + 4x-5x-20=0
6) x +12x+2x+24=0
9) x³ +3x² - 4x-12=0
12) (x-2)² - 4x+8 = 0
15) (x-4)² - 4x+16=0
18) 4x² -25+ (2x + 5)² =0
21) x² −1+ (x+1)(x-3)=0