payshencec21
payshencec21
27-05-2018
Mathematics
contestada
Please help asap. 55 points
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trainboxcar20
trainboxcar20
27-05-2018
The answer would be B. Using the foil method to check, the two k's equal k^2, then the k and -f would equal -fk, plus the 2fk would equal a positive fk. Lastly, the 2f and -f would equal -2f^2.
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vinyl50098
vinyl50098
27-05-2018
[tex]k^2+kf-2f^2[/tex]
=[tex]k^2+kf-f^2-f^2[/tex]
=[tex]k^2-f^2+kf-f^2[/tex]
=[tex](k+f)(k-f)+f(k-f)[/tex]
=[tex](k+2f)(k-f)[/tex]
B
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