Question

16. Devin was asked to subtract

the expression 5x - 7 and
-2x + 6. His work is shown
below.
(5x-7) −(−2x+6)
= 5x - 7+2x+6
= 5x + 2x - 7+6
= 7x-1
Step 1
Step 2
Step 3
Step 4
In which Step did Devin
make his first mistake?
Explain.explain

Answer 1

2

Explanation:

he must multiply the bracket by -