The row-echelon form of the augmented matrix of a system of equations is given. Find the solution of the system. 1 0 -5 -4
0 1 5 1
0 0 0 0

What is the expression in factored form? 225x^2 - 144 a. 9(5x+4)^2 b. 9(5x-4)^2 c. 9(4x+5)(4x-5) d. 9(5x+4)(5x-4)

Factor the expression using gcf 9b+45

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