Which shoes equivalent expressions?

the first option

Step-by-step explanation:

work with the first option:

a^2 + 3b -2a^2 = 3a^2 + 3b -4a^2

working with the left side:

simplify like terms: a^2 -2a^2 = -a^2

so, the left side is -a^2 + 3b

working with the right side:

simplify like terms: 3a^2 - 4a^2 = -a^2

so, the right side is -a^2 + 3b

set those equal to each other

-a^2 + 3b = -a^2 + 3b

they equal each other, so the first answer is correct.