How do you solve #81b ^ { 2} - 10= 90#?

1 Answer
Suren Abreu
Nov 1, 2016

#b=+-1 1/9#

Explanation:

#81b^2-10=90#

Add #10# to each side.

#81b^2=100#

Divide both sides by #81#.

#b^2=100/81#

Calculate the square root of both sides. Keep in mind that the result could be either a positive or a negative since the square of both is a positive.

#b=+-sqrt(100/81)#

#b=+-10/9#

#b=+-1 1/9#

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