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Verified answer
∫ x (x+3)⁴ dxMisal u=x+3 , x=u-3
du/dx = 1
du=dx
∫(u-3)u⁴ du
=>∫u⁵ - 3u⁴ du
=>u⁶/6 - 3u⁵/5 du
=>(x+3)⁶/6 - 3(x+3)⁵/5 + C