MathCrazyFool
Simplify (2 + squareroot5)(2  squareroot5)



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sauravshakya
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Hint:
(a+b)(ab)=a^2  b^2

sauravshakya
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Does it help?

MathCrazyFool
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2^2  5?

sauravshakya
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yes

MathCrazyFool
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Thanks so much! I wasn't even thinking this ><

sauravshakya
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Welcome