Which step he made an error and what he supposed to do instead?

step 1

Step-by-step explanation:

however the second part of the equation is incorrectly expanded.

-(3y^2 + 6y + 2)

above states (-3y^2 add 6y add 2)

the -3y^2 is correct because a negative variable and positive variable make a negative variable

however; it should be (-3y^2 minus 6y minus 2 instead of add) because when two variables of different signs (negative and positive) are multiplied the resultant should be negative.

answer: ok

step-by-step explanation:

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8