How do you rewrite an equation by completing the square?
x^2+10x+21=0

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

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