- Let A be an n x n matrix such that A^2 + A^2 = 0. Show that (A^2 + A + I)^-1 = (A^2 - A + I)?

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Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4? How many edges in a circle? What do people do when they are fine and everythings good? How do i know what to do now that ive reached my goals? Can reality itself be programmed by interacting with it - in particular asking questions that lead to where you're directing it to go? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20?