Pls with step.

plsss.

is anyone solving this?

pls help

Step-by-step explanation:

12ab - 10b² - 18a² + 9ab + 12b² +  14a²

= 12ab + 9ab  - 10b² + 12b² -18a² + 14a²     {Combine like terms}

= (12 + 9)ab + (-10 + 12)b² + (-18 + 14)a²

= 21ab + 2b²  - 4a²

ab + 2b² + 3b² - a² = ab + (2+3)b² - a²

                               = ab + 5b² - a²

Now find the difference

ab + 5b² - a² - [ 21ab + 2b²  - 4a²]

= ab + 5b² -a² - 21ab - 2b² + 4a²

= ab - 21ab  + 5b² - 2b² - a² + 4a²

=  -20ab + 3b² + 3a²

2) 2x³ – 3x² y +2xy²+3y³ - unknown polynomial =  x³ -2x² y+3xy²+4y³

2x³ – 3x² y +2xy²+3y³ =  x³ -2x² y+3xy²+4y³ +  unknown polynomial

2x³ – 3x² y +2xy²+3y³ - [ x³ -2x² y+3xy²+4y³] = unknown polynomial

2x³ – 3x² y +2xy²+3y³ - x³  + 2x² y- 3xy²- 4y³ =

2x³ - x³ -3x²y  +2x²y  + 2xy² - 3xy²  + 3y³ - 4y³=

x³ - x²y  - xy² - y³

x³ - x²y  - xy² - y³

$8

step-by-step explanation:

it is pretty much backwards.

you take the 4x2 multiply that, and that is = $8