\(\left(9x-1\right)^2+\left(1-5x\right)^2+2\left(9x-1\right)\left(1-5x\right)\)
\(=\left(9x-1+1-5x\right)^2=\left(4x\right)^2=16x^2\)
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(9x - 1)2 + (1 - 5x)2 + 2(9x - 1)(1 - 5x)
= 81x2 - 18x + 1 + 1 - 10x + 25x2 + (18x - 2)(1 - 5x)
= 81x2 + 25x2 - 18x - 10x + 1 + 1 + 18x - 90x2 - 2 + 10x
= 106x2 - 90x2 - 28x + 18x + 10x + 2 - 2
= 16x2
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