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

2 Answers
Deepak G.
Sep 4, 2016

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

EZ as pi
Sep 4, 2016

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

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