Question

12) 1 + √10 mult. 2, 1-√10​

Answer 1

We can simplify this expression by using the formula (a + b)(a - b) = a^2 - b^2:

(1 + √10)(1 - √10) = 1^2 - (√10)^2 = 1 - 10 = -9

Therefore,

(1 + √10)(1 - √10) = -9

Now we can multiply by 2:

2(1 + √10)(1 - √10) = 2(-9)

2(1 - 10) = -18

So the final result is -18.