`(x+1)^2-2=(x-1)(x+1)`
⇔`x^2+2x+1-2-x^2+1=0`
⇔`2x=0`
⇔`x=0`
Vậy `x=0`
Choose the best answer.
I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.
We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.