√3+√7 / √7-√3 find value of a-b√21
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I don't know this questionI don't know this question4x²-36
=(2x)²-(6)²
=(2x+6)(2x-6)4x²-36
=(2x)²-(6)²
=(2x+6)(2x-6)4x²-36
=(2x)²-(6)²
=(2x+6)(2x-6)4x²-36
=(2x)²-(6)²
=(2x+6)(2x-6)4x²-36
=(2x)²-(6)²
=(2x+6)(2x-6)
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