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Mathematics 20 Online
OpenStudy (anonymous):

9x^2-42+49

OpenStudy (jiteshmeghwal9):

use the identity\[\Huge{\color{red}{x^2+(a+b)x+ab}}\]

OpenStudy (jiteshmeghwal9):

Isn't there 42x ??

OpenStudy (anonymous):

25 9x2=18-42+49=25

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