Question

-4B^2*(2B^6+3B^4-7B^2-4)+4B^8

Answer 1

=$-8 B^{8} -12 B^{6} +28 B^{4} +16 B^{2} +4 B^{8} =-4 B^{8} -12B^{6} +28 B^{4} +16 B^{2}$