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September 19, 2014

September 19, 2014

Posted by **ggift** on Monday, September 14, 2009 at 10:36pm.

4x - 18 = 65

wouldn't x = 7

- ALGEBRA -
**Reiny**, Monday, September 14, 2009 at 10:56pmno

how did you get x=7 ?

4x - 18 = 65

add 18 to both sides

4x - 18 + 18 = 65 + 18

4x = 83

divide both sides by 4

x = 83/4 (not even anywhere close to 7)

- ALGEBRA -
**ggift**, Tuesday, September 15, 2009 at 6:38ami thought that it would be 7 because when i subtracted 18 from 65 i got 47 and 7 was missing from 4x

- ALGEBRA -
**MathMate**, Tuesday, September 15, 2009 at 8:35amThe interpretation of 4 and x in the expression "4x" as digits is used occasionally in mathematics, but more an exception than the rule.

In algebra, the multiplication sign is omitted when we multiply together two mathematical symbols or a number and a mathematical symbol.

For example,

xy is the same as x*y, and

4z equals 4*z.

It's the same principle as when we say 3 apples meaning 3 times the apples.

However, when we deal with two numbers, the multiplication sign is obligatory.

- ALGEBRA -
**ggift**, Tuesday, September 15, 2009 at 5:45pmOh, okay, thank you for explaining it to me.

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