Answer:
\[{{\left( 2x+5 \right)}^{2}}{{(2x-5)}^{2}}=\left[ {{\left( 2x \right)}^{2}}+{{\left( 5 \right)}^{2}}+2\times 2x\times 5 \right]\] \[\left[ {{\left( 2x \right)}^{2}}+{{\left( 5 \right)}^{2}}2\times 2x\times 5 \right]\] \[=\left[ 4{{x}^{2}}+25+20x \right]\left[ 4{{x}^{2}}+2520x \right]\] \[=\text{ }4{{x}^{2}}+25+20x\text{ }4{{x}^{2}}25+20x\] \[=20x+20x\] \[=\text{ }40x\]
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