SOLUTION: Could u please help me with this? In the equation c squared-4=0, c is equal to what?

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Question 202110: Could u please help me with this? In the equation c squared-4=0, c is equal to what?
Found 2 solutions by rfer, jim_thompson5910:
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
2squared=4
-2 squared=4
4-4=0

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!

c%5E2-4=0 Start with the given equation.


Notice that the quadratic c%5E2-4 is in the form of Ac%5E2%2BBc%2BC where A=1, B=0, and C=-4


Let's use the quadratic formula to solve for "c":


c+=+%28-B+%2B-+sqrt%28+B%5E2-4AC+%29%29%2F%282A%29 Start with the quadratic formula


c+=+%280+%2B-+sqrt%28+%280%29%5E2-4%281%29%28-4%29+%29%29%2F%282%281%29%29 Plug in A=1, B=0, and C=-4


c+=+%280+%2B-+sqrt%28+0-4%281%29%28-4%29+%29%29%2F%282%281%29%29 Square 0 to get 0.


c+=+%280+%2B-+sqrt%28+0--16+%29%29%2F%282%281%29%29 Multiply 4%281%29%28-4%29 to get -16


c+=+%280+%2B-+sqrt%28+0%2B16+%29%29%2F%282%281%29%29 Rewrite sqrt%280--16%29 as sqrt%280%2B16%29


c+=+%280+%2B-+sqrt%28+16+%29%29%2F%282%281%29%29 Add 0 to 16 to get 16


c+=+%280+%2B-+sqrt%28+16+%29%29%2F%282%29 Multiply 2 and 1 to get 2.


c+=+%280+%2B-+4%29%2F%282%29 Take the square root of 16 to get 4.


c+=+%280+%2B+4%29%2F%282%29 or c+=+%280+-+4%29%2F%282%29 Break up the expression.


c+=+%284%29%2F%282%29 or c+=++%28-4%29%2F%282%29 Combine like terms.


c+=+2 or c+=+-2 Simplify.


So the solutions are c+=+2 or c+=+-2