Question

Find the value of the expression if x = –1 and y = 2, 3x³ y– 4x² y + 7xy – 3​

Answer 1

Step-by-step explanation:

• 3x³ y– 4x² y + 7xy – 3
• $3 \times { - 1}^{3} \times 2 - 4 \times { - 1}^{2} \times 2 + 7 \times - 1 \times 2 - 3$
• $3 \times - 1 \times 2 - 4 \times 1 \times 2 + - 14 - 3$
• $- 6 - 8 - 14 - 3$
• $\longrightarrow \: - 31$

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Answer 2

Answer:

$3x {}^{3} y - 4x {}^{2} y + 7xy - 3. \\ 3( - 1) {}^{3} \times 2 - 4( - 1) {}^{2} \times 2 + 7( - 1)(2) - 3. \\ - 3 \times 2 + 4 \times 2 - 14 - 3. \\ - 6 + 4 \times 2 - 14 - 3. \\ - 2 \times 2 - 14 - 3. \\ - 4 - 14 - 3. \\ - 18 - 3. \\ = - 21.$