1.

X^2 - 17x-84 factorise urgent

Answer»

X² - 17x - 84

=> x² - ( 21 - 4 ) X - 84

=> x² - 21X + 4x - 84

=> x( x - 21 ) + 4( x - 21 )

=> ( x - 21 ) ( x + 4 )





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