Đáp án:
Giải thích các bước giải:
$\text{20/ 10x² - 4x - 6}$
$\text{= 10x²-10x+6x-6}$
$\text{= 10x(x-1)+6(x-1)}$
$\text{=(10x+6)(x-1)}$
$\text{=2(5x+3)(x-1)}$
$\text{22/ 10x²+7x-6}$
$\text{= 10x²-5x+12x-6}$
$\text{= 5x(2x-1)+6(2x-1)}$
$\text{= (5x+6)(2x-1)}$
$\text{24/ 10x²+17x-6}$
$\text{= 10x²+20x-3x-6}$
$\text{=10x(x+2)-3(x+2)}$
$\text{= (10x-3)(x+2)}$
$\text{26/ -10x²+28x+6}$
$\text{= -10x²+30x-2x+6}$
$\text{= -10x(x-3)-2(x-3)}$
$\text{=(-10x-2)(x-3)}$
$\text{=-2(5x+1)(x-3)}$
$\text{28/ 10x²-7x-12}$
$\text{= 10x²-15x+8x-12}$
$\text{= 5x(2x-3)+4(2x-3)}$
$\text{= (5x-4)(2x-3)}$
$\text{30/ 10x²- 14x-12}$
$\text{= 10x²-20x+6x-12}$
$\text{= 10x(x-2)+6(x-2)}$
$\text{= (10x+6)(x-2)}$
$\text{= 2(5x+3)(x-2)}$
