X squared plus 2 x equals 15

x2+2x=15

what number should be added to both sides of the equation to complete the square?

Mary sold half of her comic books and then bought nine more. She now has eleven so how many did she began with?

How are the expressions 0.4+1.5 and 1.5 + 0.4 alike? different?

If a and b must be positive integers, what is the largest integer n such that 13a + 18b = n has no solutions?

Which expression finds the measure of an angle that is coterminal with a 126° angle?

What is the length of the resulting arrow when you add two arrow in the negative direction?

What do Properties mean?

Our success rate, depending on the year, is between 35 and 40 percent, according to the website, in 2015,234 raptors were taken in based on this data, about how many raptor rescues were successful that year

The sum of a number and twice its reciprocal is 27/5. Find the number.

Airbus is a major manufacturer of aircraft in Europe. Each of their A330 planes costs around 40 million dollars and Airbus' revenue (money coming in) can be modeled as a function of the number of aircraft it sells.

Which function has an inverse that is a function? A. b (x) = x^2+3 B. d (x) = -9 C. - 7x D. p (x) = lxl