<span>( 2x - 9 ) ( x + 6 )
( 2x ) ( x ) + ( 2x ) ( 6 ) + ( - 9 ) ( x ) + ( - 9 ) ( 6 )
2x² + 12x - 9x - 54
2x² + 3x - 54.</span>
Step-by-step explanation:

I think, he made a mistake because the exponents have different values but then if you'll look at his results, he just wrote the same thing. If you want, you could post the original problem, and I'll solve it for you :)
Answer:
y=5x+10
Step-by-step explanation:
Answer:
No
Step-by-step explanation:
70 * 8 = 560, not 490
Instead, 70 * 7 = 490