notsomathwiz notsomathwiz

21-01-2016
Mathematics

contestada

Solve for x: −3|x + 7| = −12

Respuesta :

21-01-2016

-3Ix + 7I = -12 (divide -3 from each side)

Ix + 7I = -12/3

Ix + 7I = -4

x + 7 = -4 or -x - 7 = -4

x = -11 or -x = 3
x = - 3

x = -3 or -11

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Billymkhoi Billymkhoi

21-01-2016

-3|x+7|= -12
⇒ |x+7|= -12/(-3)
⇒ |x+7|= 4
⇒ x+7= 4 or x+7= -4
⇒ x= 4-7 or x= -4 -7
⇒ x= -3 or x= -11

Final answer: x= -3 or x= -11~

Answer Link

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