You will have to take 3x common from both terms and your ans should look like this,
3x(9x^2-4)
1/10x200
= 1/10x200/1
= 200/10
=20
the answer is 20
if u dont understand, 1/10 means a part of 200 that is divided by 10 which means the number x10 =200. So if u dont understand, you can check answer this way: n*10=200
200/10=n
n= 20
15x, because 2 × 4x= 8x and -1×-7=7x...add 8x and 7x ull get the answer
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