(x+4) and ( x-5) are the factors of ------------
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Answer:
ans. is X2 -9x -20
Step-by-step explanation:
x2 -9x +20 =0
x2 -5x - 4x +20
x(x-5) - 4(x-5)
(x-4) (x+5)
now,
x-4 = 0. and x+5= 0
x= 4. x=-5
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