4x - 12x5
In this case, this is an expression in terms of x. The only way it could be simplified would be to factor out the 4x to get
4x(1-3x4)
OR, you could have meant the following:
4 x (-12) x 5
= -20 x 12
= -240
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12x-17x = -5
12x + 5 - 2x =(12x - 2x) + 5 =10x + 5 =5 (2x + 1)
When x = 5, 12x = 12*5 = 60.
x2+12x+5 = 3 x2+12x+5-3 = 0 x2+12x+2 = 0
4x2 + 12x + 5 = (2x + 1)(2x + 5).