split the middle term of x square - 20 X - 4800 is equal to zero
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x² - 20x - 4800 = 0
x² - 80x + 60x - 4800 = 0
x (x - 80 ) 60( x - 80 ) = 0
(x - 80 ) (x + 60 ) = 0
( x -80 ) = 0
x = 80
( x + 60 ) = 0
x = - 60
check this image.
here is your answer.
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Answer:
x= -60 is answer
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