- 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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Which lunar phase would be observed from the Earth, if the moon were at a 90° angle with the earth and sun? Please show step -by- step how to solve the following problem. Please show how to reduce to least terms. Thank you. 36/(1 + 1/5)^2? Can cigarette ashes tarnish copper? Name two groups that are absolutely essential to the functioning of an ecosystem and explain why? What is the next number in this sequence? 1,1,2,4,5,25?