Question

Using the identity (I),find i).3x+7)²

Answer 1

Answer:

${(3x + 7)}^{2} \\ {(3x)}^{2} + {7}^{2} + 2(3x)(7) \\ {9x}^{2} + 49 + 42x \\ 9 {x}^{2} + 42x + 49$

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