liznasty
liznasty
25-08-2015
Mathematics
contestada
What is the expression x2-4 for a=b=3x=5 and y=4
Respuesta :
AL2006
AL2006
25-08-2015
The expression [ x² - 4 ] doesn't depend on 'a', 'b', or 'y'.
It only depends on 'x'.
You have said that 3x = 5, so x = 5/3.
Therefore, I may now write '5/3' in place of 'x' in the expression:
x² - 4 =
(5/3)² - 4 =
(25/9) - 4 =
(25/9) - (36/9) =
(25 - 36) / 9 = -11/9 =
- (1 and 2/9)
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