Question

factorise and find the value of x^2-6xy+9y^2 where X=2 and y=3
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Answer 1

${x}^{2} - 6xy + 9y {}^{2} \\ (2 {)}^{2} - 6 \times 2 \times 3 + 9(3 {)}^{2} \\ = 4 - 36 + 81 \\ = 85 - 36 \\ = 49$