so, what don't you know abouth the formula? You have
a = 5
b = -10
c = 6
Now just plug them into the formula.
Use quadratic formula to solve:
5x^2-10x+6=0
3 answers
I got the answer 10 plus or minus square root of -2 equals 0....not sure if that's the final answer or not
You can always use wolframalpha.com to verify your work. For example,
http://www.wolframalpha.com/input/?i=5x^2-10x%2B6%3D0
You got 10±√-2
That is clearly wrong. The formula states
x = [-b±√(b^2-4ac)]/2a
= [10±√(100-120)]/10
= (10±√-20)/10
= (10±2√-5)/10
= 1±√-5/5
= 1 ± 1/√5 i
I expect that you can now find your mistake(s)
At the very least you cannot say 10±√-2 = 0
http://www.wolframalpha.com/input/?i=5x^2-10x%2B6%3D0
You got 10±√-2
That is clearly wrong. The formula states
x = [-b±√(b^2-4ac)]/2a
= [10±√(100-120)]/10
= (10±√-20)/10
= (10±2√-5)/10
= 1±√-5/5
= 1 ± 1/√5 i
I expect that you can now find your mistake(s)
At the very least you cannot say 10±√-2 = 0
0 answers