Question

Solve please:
\[-3\left| 4-x \right|+3\le-9\]

Answer 1

−3|4−x|+3≤−9
Divide by 3
−|4−x|+1≤−3
transpose
3+1≤|4−x|
4≤|4−x|
case 1: 4-x >=0, then 4-x >=4, x<=0
case 2: 4-x <0 then -(4-x)>=4 => x-4>=4 => x>=8

Answer 2

Great this is an online quiz so i need fast things lol xD

Answer 3

Solve please\[\left| x+7 \right|=3\]

Answer 4

Same,
case 1: x+7=3 => x=-4
case 2: -(x+7)=3 => x=-10