SOLUTION: How do I complete this square? 2x^2+7x+3=0 The answer is supposed to be -3, 1/2 but I keep getting an answer with an imaginary number(-7+-7i)/4... I don't know why? Thank

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: How do I complete this square? 2x^2+7x+3=0 The answer is supposed to be -3, 1/2 but I keep getting an answer with an imaginary number(-7+-7i)/4... I don't know why? Thank      Log On


   

Question 669919: How do I complete this square?
2x^2+7x+3=0
The answer is supposed to be -3, 1/2
but I keep getting an answer with an imaginary number(-7+-7i)/4... I don't know why?
Thank you in advance!
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
2x%5E2+%2B+7x+%2B+3+=+0
...
2x%5E2+%2B+7x++=+-3
...
x%5E2+%2B+7%2F2x+=+-3%2F2
...
x%5E2+%2B+7%2F2x+%2B+49%2F16+=+-3%2F2+%2B+49%2F16
...
%28x%2B7%2F4%29%5E2+=+25%2F16
...
sqrt%28x%2B7%2F4%29%5E2+=+%2B-+sqrt%2825%2F16%29
...
x%2B7%2F4+=+%2B-sqrt%2825%2F16%29
x+=+-7%2F4+%2B-+sqrt%2825%2F16%29
x+=+-7%2F4+%2B-+5%2F4
...
-7%2F4+%2B+5%2F4+=+-2%2F4+=+-1%2F2
-7%2F4+-+5%2F4+=+-12%2F4+=+-3