binomial expansion

[mystic bone]

ive done b

idk how to do a or c

[dusk thorn]

Well the only things that will matter are coefficients up until x^2 of (2-3x)^2
and the coefficients up until x^2 of (1+4x)^7

then just multiply whichever ones make coefficient of x^2

[mystic bone]

so id need to expand it fully out the multiply the x^2 coefficients?

[dusk thorn]

Not fully

Just to the x^2 term for both brackets

[mystic bone]

i did that but didnt get the right answer

[dim lagoon]

how u do b?

[mystic bone]

use the formula

1 + nx + n(n-1)

[dim lagoon]

oh yh

[mystic bone]

then make the nx = 40x

[dim lagoon]

yeahh

[dim lagoon]

what did u get

[mystic bone]

i rubbed it out

i expanded the first one

and the second one once

then x the x^2

[dim lagoon]

what does that mean

oh

okay nvm