Sort of lost on how to continue...

Prove that the following formula is true for all n using inductive reasoning 3 + 7 + 11 + .... +(4n - 1) = n(2n + 1)

n = 1 is true

assume k1 is true? (4k - 1) = k(2k + 1)

now to prove k + 1

[4(k+1) - 1] + (4k - 1) = k(2k + 1) + [4(k+1) - 1]

Would someone mind showing me where to go from here?