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March 4, 2015

March 4, 2015

Posted by **Barbie** on Friday, May 20, 2011 at 12:27am.

x^2+14x+98

I think i understand the basics of the method, but in this particular question I'm finding it hard to use the appropriate factors of 98 - 7 and 14 - to factorize 14x.

- Completing the square -
**Damon**, Friday, May 20, 2011 at 2:53amx^2 + 14 x + 98 = 0 I assume

x^2 + 14 x = -98

14/2 = 7

7^2 = 49

x^2 + 14 x + 49 = -98 + 49

(x+7)^2 = -49

square root of a negative number is imaginary

x+7 = -7i or + 7i

x = -7 -7i = -7 (1+i)

or

x = -7 + 7i = -7 (1-i)

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