Asked by John
Solve the equation by factoring.
2x^2 + 8x + 1 = 0
How do I arrive at this answer?
-2 + or - radical 14 over 2
2x^2 + 8x + 1 = 0
How do I arrive at this answer?
-2 + or - radical 14 over 2
Answers
Answered by
Reiny
First of all the equation does not factor over the rationals.
Secondly your answer is not correct.
use the formula
x = (-8 ±√(64-4(2)(1))/4
= (-8 ±√56)/4
= (-8 ± 2√14)/4
= (-4 ± √14)/2
(it works, I subbed it back in)
Secondly your answer is not correct.
use the formula
x = (-8 ±√(64-4(2)(1))/4
= (-8 ±√56)/4
= (-8 ± 2√14)/4
= (-4 ± √14)/2
(it works, I subbed it back in)
Answered by
Sean
the answer i provided was from the back of the book.
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