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Can someone help me solve this question? | x-9 | +7 = 8
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4 votes
Can someone help me solve this question? | x-9 | +7 = 8

User Pushker Yadav
by
3.5k points

1 Answer

5 votes

Answer:

x = 8

x = 10

Explanation:

lx -9l + 7 = 8

lx - 9l + 7 - 7 = 8 - 7

lx - 9l = 1

Split into a positive and a negative case.

x - 9 = 1 and - (x - 9) = 1

Add nine to both sides

x - 9 + 9 = 1 + 9

x = 10

- (x - 9) = 1

Subtract 9 from both sides

- 8 = - x

Multiply both sides by negative 1

x = 8

User Brent Edwards
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