Solve for A
A=5\left(x-2\right)\left(5x+6\right)
Solve for x (complex solution)
x=\frac{-\sqrt{A+64}+2}{5}
x=\frac{\sqrt{A+64}+2}{5}
Solve for x
x=\frac{-\sqrt{A+64}+2}{5}
x=\frac{\sqrt{A+64}+2}{5}\text{, }A\geq -64
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A=25x^{2}-20x+4-64
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-2\right)^{2}.
A=25x^{2}-20x-60
Subtract 64 from 4 to get -60.
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