What is the Distance between the x-intercepts?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1

Which graph represents the equation y =4x