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Q.

Factor of x2 + 100 = 20x is?

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a

x = 40   

b

x = 10   

c

x = 20   

d

x = 30 

answer is B.

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Detailed Solution

x2 + 100 = 20x
x2               + 100 =      20x
    -20x                       -20x       Take 20x away from both sides.
x2 - 20x + 100 = 0
(x - 10)(x-10) = 0
x - 10 = 0          x - 10 = 0
Set each variable to a value of 0
x - 10 = 0
    + 10 =+10 Add 10 more on each side
x = 10
 
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