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Make it easier, divide by 3: 3(x2 - 8x - 16) This is as far as it goes. (Quadratic formula gives roots as 9.66 and -1.66)
If that denominator is x + 2, a value of -2 for x would not make sense as division by zero is undefined.
The absolute value of the opposite of x is x. The absolute value is the number's distance from zero on a number line. Distance can not be negative, so basically, to find the absolute value of a number you just need to make it positive. The opposite of x is -x. |-x|=x - you make the x positive Of course, if x, to begin with, represents a negative (less than zero) number than the absolute value would be -x. For example if x=-3, the opposite value of x would be 3 and the absolute value of x would also be 3 which happens to be -x.
The question does not make sense because there is no x in "l m".
A variable can not hold more than one value at any given moment in time. It would have only one. If you wanted more than one value, you would have to make the variable an array.