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(7+√5)+(7-√5)=? |
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Answer» 14 {tex}\\begin{array}{l}\\left(7+\\sqrt5\\right)\\left(7-\\sqrt5\\right)\\\\By\\;identity\\;:\\;(a+b)(a-b)=\\;a^{2\\;}-b^2\\\\=\\;7^{2\\;}-\\;(\\sqrt5)^2\\\\=\\;49\\;-\\;5\\\\=\\;44\\;\\end{array}{/tex} 44 2 |
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