denisegonzalez9 denisegonzalez9

20-06-2016
Mathematics

contestada

-2|2.2x-3.3|=-6.6 solve for x

Respuesta :

Аноним Аноним

20-06-2016

-2[2.2x-3.3]=-6.6
[2.2x-3.3]=-6.6 /-2
[2.2x-3.3]=3.3
We have two equations:
1)
2.2x-3.3=3.3
2.2x=3.3+3.3
2.2x=6.6
x=6.6/2.2
x=3

2)
2.2x-3.3=-3.3
2.2x=-3.3+3.3
2.2x=0
x=0/2.2
x=0

Answer: we have two solutions: x=0 and x=3.

Answer Link

lifeinferno lifeinferno

20-06-2016

-2|2.2x - 3.3| = -6.6. From it: |2.2x - 3.3| = 3.3. We have 2 variants: 1) 2.2x - 3.3 = -3.3. Then 2.2x = -3.3 + 3.3, so 2.2x = 0 => x = 0. 2) 2.2x - 3.3 = 3.3. Then 2.2x = 3.3 + 3.3, so 2.2x = 6.6 => x = 3. Answer: 0; 3.

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