How do you solve #8b^2-7=193#?

2 Answers
Sep 4, 2016

Answer:

#b=+-5#

Explanation:

#8b^2-7=193#

or

#8b^2=193+7#

or

#8b^2=200#

or

#b^2=200/8#

or

#b^2=25#

or

#b=sqrt25#

or

#b=+-5#

Sep 4, 2016

Answer:

#x = +-5#

Explanation:

Usually a quadratic equation is solved by making it equal to 0.
However this is a special case where there is no term in #x#.

Isolate the #x^2# term by adding 7 to both sides.

#8x^2-7 color(blue)(+7)= 193 color(blue)(+7)#

#8x^2 = 200 " "larr div 8#

#x^2 = 25#

#x = +-sqrt25#

#x = +-5#