Question

Ned divided a given number by 3 and then added 2. If he should have multiplied the number by 3 and then subtracted 2, which of the following two steps can he do next to get the correct answer?


Subtract 4 and then multiply by 9.



Subtract 12 and then multiply by 3.



Multiply by 3 and then subtract 4.



Multiply by 6 and then subtract 14.



Multiply by 9 and then subtract 20.


I think C.

Answer 1

he has n/3 + 2
he wants 3n - 2

to get the 3n, he needs to multiply by 9. That will give him 3n+18

So, then he needs to subtract 20.

Answer 2

Subtract 3(-x2 +6xy-4) -2y2+9 from 12-2y(y-9x)+x²