Please explain question no. 29 from the above pic
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factorize x² - x - 42
= x² - ( 7 - 6 ) x - 42
= x² - 7x + 6x - 42
= x ( x - 7 ) + 6 ( x - 7 )
= ( x - 7 ) ( x + 6 )
Hence the value of k is -7 .
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