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How do you solve #v^2+ 10v - 21 = 0# by completing the square?

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1 Answer

May 2, 2015

#y = v^2 + 10.v - 21 = 0#

#y = v^2 + 10v + 25 - 25 - 21 = 0#

(v + 5)^2 = 46

#v + 5 = sqr46 -> v = -5 + sqr46#
#v + 5 = -sqr46 -> v = -5 - sqr46#

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