$$(5-2x)(5+2x)(25+ { \left(4x \right) }^{ 2 }$$
$625+300x^{2}-64x^{4}$
$$\left(5-2x\right)\left(5+2x\right)\left(25+4^{2}x^{2}\right)$$
$$\left(5-2x\right)\left(5+2x\right)\left(25+16x^{2}\right)$$
$$\left(25-4x^{2}\right)\left(25+16x^{2}\right)$$
$$625+300x^{2}-64x^{4}$$
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