Verified answer

98^(n+2) = (2*49)^(n+2) = 2^(n+2) * 7^(2n+4)

56*98^(n+2)                    56 * 2^(n+2) * 7^(2n+4)

---------------------- = ----------------------------------

2^(n+3) * 7^(2n+5)                2^(n+3) * 7^(2n+5)

56 * 2^(n+2-n-3) * 7^(2n+4-2n-5) = 56 * 2^(-1) * 7^(-1) = 56/(2*7) = 4