kenariachrista
12.10.2020 •
Mathematics
A store sells barrettes for $2 each and combs for $1. Shelby buys 3 barrettes and a comb. Kendra buys 2 barrettes and 4 combs. Write and solve an expression for the amount the two girls spent all together. I got $14 is this correct? it says on the website that it is wrong but idk if that was a mistake my teacher made. please help
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Ответ:
(2a^2-ab)( a+4b^2)
=> 2a^2(a) + 2a^2( 4b^2) - ab(a) - ab( 4b^2)
=>2a^3 + 8 a^2b^2 - a^2b - 4ab^3