SOLUTION: Give exact and approximate solutions to 3 decimal places x^2+7x-3=0 ^means it is raising to that power

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Question 471053: Give exact and approximate solutions to 3 decimal places
x^2+7x-3=0
^means it is raising to that power
Answer by ccs2011(207) About Me  (Show Source):
You can put this solution on YOUR website!
Use quadratic formula:
x+=+%28-b+%2B-+sqrt%28b%5E2+-4ac%29%29%2F%282a%29
where
a= 1
b = 7
c = -3
x+=+%28-7+%2B-+sqrt%287%5E2+-4%281%29%28-3%29%29%29%2F%282%281%29%29
Simplify
x+=+%28-7+%2B-+sqrt%2849%2B12%29%29%2F2
x+=+%28-7+%2B-+sqrt%2861%29%29%2F2
Using calculator, approximate solutions are:
x+=+0.405, x+=+-7.405