Question

Can someone please help me with this and show work if you can .

Answer 1

see in step 2, he added 20 at x² + 8x - 70 and 0

but he must add 70 at x² + 8x - 70 and 0 to have x² + 8x = 70

Explanation:

Answer 2

he didn’t add 16 to the other side which made it unequal