To determine what must be subtracted from 3 to get 9, we can set up a simple equation. Let’s denote the unknown number we need to subtract as x.
The equation can be stated as:
3 – x = 9
To find x, we can rearrange the equation:
– x = 9 – 3
– x = 6
Next, we multiply both sides by -1 to solve for x:
x = -6
Therefore, you must subtract -6 from 3 to achieve a result of 9. In other words, subtracting a negative number is equivalent to adding its absolute value, which means:
3 – (-6) = 3 + 6 = 9
So, the answer is that you need to subtract -6 from 3 to get 9.