What equation results from completing the square and factoring x2+2×=9a. (×+1)^2=10b. (×+2)^2=8c. (×+2)^2=10d. (×+1)^2=8

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5

How is this equation completed? i cannot find any examples in the book.