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Find the value of algebraic expression x^3 - 3x^2y +9 if x = -1 , y = 2 ​

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\qquad \qquad\huge \underline{\boxed{\sf ᴀɴsweʀ}}

Let's solve ~


\qquad \sf  \dashrightarrow \: x {}^(3) - 3 {x}^(2) y + 9

Now, use the given values :

  • x = -1

  • y = 2


\qquad \sf  \dashrightarrow \: ( - 1) {}^(3) - (3 * ( - 1) {}^(2) * 2) + 9


\qquad \sf  \dashrightarrow \: - 1 - ( 3* 1 * 2) + 9


\qquad \sf  \dashrightarrow \: - 1 - 6 + 9


\qquad \sf  \dashrightarrow \: - 7 + 9


\qquad \sf  \dashrightarrow \: 2

User Cyril Mottier
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