Both of the following expression are equivalent to 16x^2 yet Khan marks one right and the other wrong. That's probably because I am wrong and can't see where I am wrong. Please write me how I'm wrong.
8x(2x-1) = 16x^2 - 8x
8(2x^2 - x) = 16x^2 - 8x
To me, they are both right. But recently Khan marked the first one right, and the second one wrong. Khan gave 4 choices. The above where 2 of the 4. On 1 was right. Yet they are both equivalent? Thanks.