Factor a number, variable or expression out of the polynomial below

x(4x-5)+9(4x-5)

a) 9x(4x+5)
b)(x+9)(4x-5)
c)9x(4x-5)
d)(x+9)(4x+5)

Factor out the (4x-5), which is the GCF to go from
x(4x-5) + 9(4x-5)
to
(4x-5)(x+9)

Note: (4x-5)(x+9) is the same as (x+9)(4x-5). The order of the factors does not matter. You can multiply in any order.

Therefore, the final answer is choice B