Question

Why is there a 180- “2x” over there ?

Answer 1

Answer:

because it is

x = 2 (90-x) above

and if we simplify it then 2 will multiply both the terms in the bracket.

So, more clearly it is

x = (2×90) - (2×x)

x= 180 - 2x

I hope you have understood now...

Answer 2

Answer:

That's how you do it!

Step-by-step explanation:

x =2(90-x)

You wil not only multiply that 2 with 90 alone... but also with the x... it is a math rule... whenever u multiply a number with a binomial ie., (x-2) or(90-x) u multiply it with both the terms inside the bracket....

Therefore now what we have is 2(90-x)

So, the way it is done is (2×90) - 2(x)

Now u see we have multiplied it with both the terms inside the bracket

The answer hence is 180 - 2x.

Glad To Help

Hope it Helps!!