2bx-a= root of a+2b×root of a-2b
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Step-by-step explanation:
4b²x² + a² - 4bxa = ( a + 2b )( a - 2b )
⇒ 4b²x² + a² - 4bxa = a² - 4b²
⇒ 4b²x² + a² - 4bxa - a² + 4b² = 0
⇒ 4b²x² - 4xa + 4b² = 0
⇒ 4b ( bx² - xa + b ) = 0
⇒ bx² - ax + b = 0
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