Based on the operation in step 3, the mathematical reasoning that we see is the Associative property.
<h3 /><h3>What is the reasoning in step 3?</h3>
Step 2 was:
= 3/4x (-8x) + (3/4x) (6)
Step 3 then became:
3/4 x (-8) × x × x + 3/4 x 6x
This shows the associative property because the numbers were regrouped but because they are being multiplied by each other, the result will not change.