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find the solution set. (x+10)(x+10)=0
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(x + 10)(x + 10) = 0
when two numbers multiply to give zero, one of them must be zero
Hence either (x + 10 ) = 0 or (x + 10 ) = 0
So If x + 10 = 0,
x = -10
Notice that the other answer from the second number is the same , but we write numbers in sets only once, we don't repeat
Solution set = {-10}
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