Question

(5a²-2b³) (2a³+5b⁴)=

Answer 1

HI,
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(5a²−2$b^{3}$)(2$a^{3}$+5$b^{4}$)

=(5a²+−2b3)(2a3+5b⁴)


=(5a²)(2a³)+(5a²)(5b⁴)+(−2b³)(2a³)+(−2b³)(5b⁴)


=10$a^{5}$+25a²b⁴−4a³b³−10$b^{7}$


=−10$b^{7}$−4a³b³+25a²b⁴+10$a^{5}$
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:-)