# math

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(10x - 1)^2
Does it = 100x + 1

• math -

(a+b)^2=a^2+2ab+b^2
(a-b)^2=a^2-2ab+b^2

Now put a=10x, b=1 and apply to (a-b)^2
(10x - 1)^2
=(10x)^2 -2(10x*))+(1)^2
=100x²-20x+1

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