Hey all, were doing quadratics and completing the square and my teacher gave us about 30 problems to work on but im really stumped on half of them. Im going to list 3 problems that are similar in how they are setup, can you show me how to solve them? I think I can figure out how to do the rest then. 1,2 & 3 are all completing the square btw!! I know how to do quadratics without a problem.
#1. 2x2-x-6=0
#2. Y=-x2+4x-7
#3. 3m2+4m-15=0
And this one we needed to do in quadratic. I got all the way to the end but the last part confused me.
2w2+3w+3=0
Then I did: the brackets will mean square root box thing, and the --- means divide, i=imaginary #
-3 +/- [(3)2-4(2)(3)]
-3+/-[9-24]
-----------
4
-3+/-[-15]
----------
4
^--that’s what I got.
The book says the answer is:
-3+/-i[16]
----------
4
I understand where you get the “I” from, but why there is a 16 instead of 15 there is what has me confused.
Really appreciate the help
#1. 2x2-x-6=0
#2. Y=-x2+4x-7
#3. 3m2+4m-15=0
And this one we needed to do in quadratic. I got all the way to the end but the last part confused me.
2w2+3w+3=0
Then I did: the brackets will mean square root box thing, and the --- means divide, i=imaginary #
-3 +/- [(3)2-4(2)(3)]
-3+/-[9-24]
-----------
4
-3+/-[-15]
----------
4
^--that’s what I got.
The book says the answer is:
-3+/-i[16]
----------
4
I understand where you get the “I” from, but why there is a 16 instead of 15 there is what has me confused.
Really appreciate the help
