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If (x2 +3x +5)(x2 +3x - 5) = m2-n2, then find m ?

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[tex](x^2+3x+5)(x^2+3x-5)=m^2-n^2\\\\\ [(x^2+3x)+5][(x^2+3x)-5]=(m+n)(m-n)\\\\m=x^2+3x;\ n=5[/tex]