Question

Simplify (9x - 6y) ²

With Step by step explanations ​

Answer 1

Step-by-step explanation:

${9x - 6y}^{2}$

$\longrightarrow \: {9x}^{2} - 2 \times 9x \times 6y + {6y}^{2}$

$\longrightarrow 81 {x}^{2} - 108xy + 36 {y}^{2}$

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• using formula
• ${x - y}^{2} = {x}^{2} - 2xy + {y}^{2}$

Answer 2

$= (x - y) ^{2} = {x}^{2} + {y}^{2} - 2xy$

$= {9x}^{2} + {6y}^{2} - 2 \times 9x ×- 6y$

$= {81x}^{2} + {36y}^{2} + 108xy$