How do i expand (3x+5) ^2

(3x + 5) ^2 expands into two binomials: (3x + 5) (3x + 5)

from there, you foil them:

(3x + 5) (3x + 5)

multiply the first terms ... 9x^2

the inside terms ... 9x^2 + 15x

outside terms ... 9x^2 + 15x + 15x

last terms ... 9x^2 + 15x + 15x + 25

then add like terms ... 9x^2 + 30x + 25

that's the expanded binomial!

I don't know how you expand it but the answer is 3x + 25 unless that's expanding.