SOLUTION: I need help with this problem: 6-8x2÷4+5. This is what i get when i try it: 6-8x2÷4+5 turns into 6-16÷4+5 turns into 6-4+5 turns into 6-9 which is -3 but -3 isn't one of the answe

Algebra ->  Signed-numbers -> SOLUTION: I need help with this problem: 6-8x2÷4+5. This is what i get when i try it: 6-8x2÷4+5 turns into 6-16÷4+5 turns into 6-4+5 turns into 6-9 which is -3 but -3 isn't one of the answe      Log On


   

Question 523000: I need help with this problem: 6-8x2÷4+5. This is what i get when i try it:
6-8x2÷4+5 turns into 6-16÷4+5 turns into 6-4+5 turns into 6-9 which is -3 but -3 isn't one of the answers on the worksheet.
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
You need to specify your problem completely. What you have provided is only an expression, which technically cannot be solved, it can only be simplified. You need an equation to solve.
.
Assuming your equation is:
.
+y+=+%286-8x%5E2%29%2F%284%2B5%29++
.
+9y+=+6+-8x%5E2+
.
+9y+=+-8x%5E2+%2B+6+
.
+y+=+-%288%2F9%29x%5E2+%2B+6%2F9+
.
+y+=+-%288%2F9%29x%5E2+%2B+2%2F3+
.
+graph%28500%2C500%2C-2%2C2%2C-2%2C2%2C-8%2F9%2Ax%5E2%2B2%2F3%29+
.
To find the zeroes (roots), set y = 0.
.
+0+=+-%288%2F9%29x%5E2+%2B+2%2F3+
.
+%288%2F9%29x%5E2+=+2%2F3+
.
+8x%5E2+=+2%2F3%2A9+=+6+
.
+x%5E2+=+6%2F8+=+3%2F4+
.
+x+=+sqrt%283%2F4%29+=+sqrt%283%29%2F2+
.
x = -.866 or .866