Simplyfy with the identity (2a-7)²
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(2a-7)^2=4a^2+49-28a
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For this question, we can use the (a - b)² = a² - 2ab + b²
(2a-7)²
(2a)² - 2 × 2a × 7 + 7²
4a² - 28a + 49
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