If a/b =c/d , show that a^3c + ac^3 = (a+c)^4

Question

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b^3d + bd^3 (b+d)^4
pl help.

Answer 1

well, we know that a/c = b/d, so

a^3c/b^3d = (a/b)^3 * c/d = (c/d)^4
ac^3/bd^3 = a/b * (c/d)^3 = (c/d)^4

see what you can do with that.