If using the method of completing the square to solve the quadratic equation x2 - 6x – 7 = 0, which number would have to be added to "complete the square"?​

Simone claims the initial value and y-intercept are the same thing on a graph. is she correct? if you know that a line has a slope of and a y-intercept of 7, what is the equation for that line in slope-intercept form?

Ten times the square of a non-zero number is eqaul to ninety times the number

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a. p.