Đáp án+Giải thích các bước giải:
`a) (x-6)²-(x-4)(x+3)=-8`
`⇔x²-12x+36-(x²+3x-4x-12)=-8`
`⇔x²-12x+36-x²-3x+4x+12=-8`
`⇔-11x+48=-8`
`⇔-11x=-56`
`⇔x=56/11`
Vậy `S={56/11}`
`c) (5x-1)²-5x(5x-1)=12`
`⇔25x²-10x+1-25x²+5x=12`
`⇔-5x+1=12`
`⇔-5x=11`
`⇔x=-11/5`
Vậy `S={-11/5}`
`d) (2x+3)²-4(x-4)²=0`
`⇔4x²+12x+9-4(x²-8x+16)=0`
`⇔4x²+12x+9-4x²+32x-64=0`
`⇔44x-55=0`
`⇔44x=55`
`⇔x=5/4`
Vậy `S={5/4}`
Chúc bn hc tốt🥰
$\text{#LinhSad}$