Question

Work out the value of (√99 - √11)²

Note : 4 root 11 does NOT work, it's not the correct answer ​

Answer 1

88

Explanation:

By squaring the equation, you cancel out the square root. So you are left with 99-11, which equals 88. I'm not sure how 4 root 11 came up, but I hope this makes sense.