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Solve for B (complex solution)
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Solve for B
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Solve for X
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X=\left(4x^{2}+12x+9\right)B
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+3\right)^{2}.
X=4x^{2}B+12xB+9B
Use the distributive property to multiply 4x^{2}+12x+9 by B.
4x^{2}B+12xB+9B=X
Swap sides so that all variable terms are on the left hand side.
\left(4x^{2}+12x+9\right)B=X
Combine all terms containing B.
\frac{\left(4x^{2}+12x+9\right)B}{4x^{2}+12x+9}=\frac{X}{4x^{2}+12x+9}
Divide both sides by 4x^{2}+12x+9.
B=\frac{X}{4x^{2}+12x+9}
Dividing by 4x^{2}+12x+9 undoes the multiplication by 4x^{2}+12x+9.
B=\frac{X}{\left(2x+3\right)^{2}}
Divide X by 4x^{2}+12x+9.
X=\left(4x^{2}+12x+9\right)B
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+3\right)^{2}.
X=4x^{2}B+12xB+9B
Use the distributive property to multiply 4x^{2}+12x+9 by B.
4x^{2}B+12xB+9B=X
Swap sides so that all variable terms are on the left hand side.
\left(4x^{2}+12x+9\right)B=X
Combine all terms containing B.
\frac{\left(4x^{2}+12x+9\right)B}{4x^{2}+12x+9}=\frac{X}{4x^{2}+12x+9}
Divide both sides by 4x^{2}+12x+9.
B=\frac{X}{4x^{2}+12x+9}
Dividing by 4x^{2}+12x+9 undoes the multiplication by 4x^{2}+12x+9.
B=\frac{X}{\left(2x+3\right)^{2}}
Divide X by 4x^{2}+12x+9.