\(\left(2a+b-5\right)\left(2a-b+5\right)\)
\(=\left[2a+\left(b-5\right)\right]\left[2a-\left(b-5\right)\right]\)
\(=4a^2-\left(b-5\right)^2\)
\(=4a^2-\left(b^2-10b+25\right)\)
\(=4a^2-b^2+10b-25\)
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\(\left(2a+b-5\right)\left(2a-b+5\right)\)
\(=\left(2a\right)^2-\left(b-5\right)^2\)
\(=4a^2-\left(b-5\right)^2\)
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