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ElenaW [278]
3 years ago
10

What's the answer to both when simplifying the two radical expression?

Mathematics
1 answer:
OlgaM077 [116]3 years ago
7 0
( \sqrt{x} +2 \sqrt{5})*( \sqrt{x} -2 \sqrt{5}) =  \\  \\   ( \sqrt{x})^2- (\sqrt{x} *2 \sqrt{5})+(2 \sqrt{5}* \sqrt{x}) -(2 \sqrt{5})^2 =  \\  \\    x- 2\sqrt{5} \sqrt{x}+2 \sqrt{5} \sqrt{x} -(4*5)=  \\  \\   x -(4*5)=  \boxed{x-20}   \\  \\

( \sqrt{x}+ \sqrt{5}) ^2=   \\  \\   ( \sqrt{x})^2+2* \sqrt{x}* \sqrt{5} + (\sqrt{5}) ^2=   \\  \\   \boxed{  x +2 \sqrt{5x}+5}
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