Mathematics
Gabbiegirl1218
2015-10-31 14:05:06
8x^2+23=823 whats going to be the answer I got 0 am I right?
ANSWERS
roxysotphy
2015-10-31 17:05:09

1) No; you are incorrect.  "0" is NOT a solution. Plug in "0" for "x" ; 8*0² + 23 =? 823? ;  8*0  + 23 =? 823? ;   0 + 23 = ? 823 ? ;  No! ;  "0 + 23 = 23 " ; NOT "823" . _________________________________________________ 2)  The answers:  x = 10, -10 ; or, write as:  x = ± 10 . _________________________________________________ To solve: GIven:  8x² + 23 = 823 ;  Subtract "23" from EACH SIDE of the equation: _____________________________________________            8x² + 23 - 23 = 823 - 23 ;  to get:              8x²  = 800 ;  Now, divide EACH SIDE of the equation by "8" ;            8x² / 8 = 800 / 8 ; to get:  x² = 100 ;          Take the "square root" of EACH SIDE of the equation; to isolate "x" on one side of the equation; and to solve for "x" ;            √(x²) = √(100) ;              x  = ± 10 . The answers:  x = 10, -10 ; or, write as:  x = ± 10 . _____________________________________________________

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