Subtract 12a² + 15ab - 20b² from 15a² + 10ab + 8b²

help.​

3a^2 + 28b^2 - 5ab

Step-by-step explanation:

here's your solution

=> to subtract (12x^2 + 15ab - 29b^2) from

( 15a^2 + 10ab + 8b^2)

=> (15a^2 + 10ab + 8b^2) - (12a^2 + 15ab - 20b^2)

=> 15a^2 + 10ab + 8b^2 - 12a^2 - 15ab + 20b^2

=> 15a^2 - 12a^2 + 8b^2 + 20b^2 + 10ab - 15ab

=> 3a^2 + 28b^2 - 5ab

hope it helps

2 over 5 and 4 over 15

don’t know last one sorry

step-by-step explanation:

i would say true? if the unit was informational and it "refreshed your understanding", then true.