- Factor each expression. 9x^2-16?

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Find all of the actual roots of the polynomial: x^3 - 2x^2 + 5x + 26 = 0? How many molecules are in 97.8g of FeCl3? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval? 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?