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OpenStudy (anonymous):
9x^2-42+49
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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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