For y=3×-2×^2+5×^3 show how to find the value for y when x=3.show your work

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asked Apr 14, 2019 226k views

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For y=3×-2×^2+5×^3 show how to find the value for y when x=3.show your work

Mathematics
middle-school

Warren Dew asked

by Warren Dew

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$\bf y=3x-2x^2+5x^3~\hspace{7em}\stackrel{\textit{let's say then x = 3}}{y=3(3)-2(3)^2+5(3)^3} \\\\\\ y=9-2(9)+5(27)\implies y=9-18+135\implies y=126$

Locnguyen answered Apr 19, 2019

by Locnguyen

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