How can we factorise X square + 400 x - 960000

1.	How can we factorise X square + 400 x - 960000
Answer» x²+400x-960000 ......................................... here,product=-960000 and sum=400.Factors=-1200 and800 .................. x²-1200x+800x-960000........... ..................... x(x-1200)+800(x-1200)............. .............. (x+800)(x-1200)=0....................... ............... x=-800or+1200

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