Thank you for the opportunity to help you with your question!
direct roots of this problem is not possible so we need to use quadratic formula to solve it
h=[ -b +- sqrt (b^2 - 4ac)] / 2a
in the given problem
so put the values in formula
h=[ -16 +- sqrt (16^2 - 4*16*672)] / 2 (16)
h=[ -16 +- sqrt (256 - 43008)] / 32
so h is
h = -1/2 + 6.46 i or h = -1/2 - 6.46 i
H is not 676 kindly check the question may be there is a typing mistake in your question and then let me know i will always be
happy to help you
Please let me know if you need any clarification. I'm always happy to answer your questions.
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Oct 2nd, 2015
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