Question

Show it using properties
(7x+3)²-84x=(7x-3)²
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Answer 1

Answer:

${49x}^{2} + 9 + 42x - 84 = {49x}^{2} + 9 - 42 \\ 42x + 42x - 84 = 0 \\ 84x - 84 = 0 \\ 84(x - 1) = 0 \\ x - 1 = 0 \\ x = 1...$

Answer 2

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