Solve. 2x2 + 20x = –38
a. –5 ± √14
b. –5 ± √51
c. –5 ± √6
d. –5 ± √13
Stacey Warren - Expert brainly.com
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c as usual. why is it always c?
can u show me how, though, im trying hard to remember but its not coming to me...
ok first off each term has a factor of 2, so we can make our life easier by writing
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then we can write the left hand side as a perfect square , by taking half of 10, which is 5, squaring and adding it to both sides to get
then take the square root, don't forget the plus and minus
then subtract 5
oh i get it now, and this is for all problems like this?
yes you can always use this method.
if you like you could write
\[x^2+10x+19=0\] and then use the quadratic formula, but that would be more work because you would have a denominator, and then you would have to simplify the radical, factor and cancel to get the answer you see above