Chứng minh biểu thức này luôn dương
N=1-x+x^2

The scale for a map is 20 miles = 1/2 inch. the distance between two towns on the map is 3 3/4 inches. what is the actual distance between these towns? 150 miles 38 miles 75 miles 135 miles

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

If you apply the changes below to the linear parent function f(x)=x what is the equation of the new function vertically stretched by a factor of 3 flip over the x axis