Answer:
Im not 100% sure but the answer is 25x^6+40x^3+16
Step-by-step explanation:
(5^3+4)^2
(5x^{3}+4)^{2}
(5x3+4)2
(5^3+4)(5^3+4)
5(5x^3+4) *x^3+4(5x^3+4)
5(53+4)⋅3+4(53+4)+4(5x^{3}+4)
5(5x3+4)⋅x3+4(5x3+4)256+203+4(53+4)
Overall the answer is 25x^6+40x^3+16
