1.

Twenty one times of a positive number is less than its square by 100

Answer»

Answer:

25

Step-by-step explanation:

21x - x^2 = 100

x^2 -21x +100 = 0

x^2-25x+4x+100 = 0

x(x-25)+4(x+25) = 0

(x-25)(x+25)(x+4) = 0

x = 25 , -25 , -4

Its GIVEN that number is positive HENCE the number is 25



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