If RT 36 find the value of x

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.