|x-3|-|2x-4|=-5 equation
The teacher will be very surprised to see your correct solution 😉
The solution
Detail solution
For every modulo expressions in the equation
allow cases, when this expressions ">=0" or "<0",
solve the resulting equation.
1.x−3≥02x−4≥0or
3≤x∧x<∞we get the equation
(x−3)−(2x−4)+5=0after simplifying we get
6−x=0the solution in this interval:
x1=62.x−3≥02x−4<0The inequality system has no solutions, see the next condition
3.x−3<02x−4≥0or
2≤x∧x<3we get the equation
(3−x)−(2x−4)+5=0after simplifying we get
12−3x=0the solution in this interval:
x2=4but x2 not in the inequality interval
4.x−3<02x−4<0or
−∞<x∧x<2we get the equation
(3−x)−(4−2x)+5=0after simplifying we get
x+4=0the solution in this interval:
x3=−4The final answer:
x1=6x2=−4
Sum and product of roots
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