(2x+1)^2-2(x-1)x(x+1)
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HV
18 tháng 11 2021
1. A doctor examined the elephant.
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2. They took it back to the zoo.
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3. The club bought him 2 years ago for a fee of $20 000.
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18 tháng 11 2021
was examined by a doctor
it was taken by them back to the zoo.
was bought by the club 2 years ago for a fee of $20 000.
was made by stephen in Hollywood last year.
was used by Irish fisherman of boat one thousand years ago.
were taken by Redwood during his voyage.
(lm zậy chắc đúng ;-;)
\(\left(2x+1\right)^2-2\left(x-1\right)\left(x+1\right)\\ =\left(4x^2+4x+1\right)-2\left(x^2-1\right)\\ =\left(4x^2+4x+1\right)-\left(2x^2-2\right)\\ =4x^2+4x+1-2x^2+2\\ =\left(4x^2-2x^2\right)+4x+\left(2+1\right)\\ =2x^2+4x+3\)