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25x^{2}-169
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25x^{2}-169
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\left(5x\right)^{2}-13^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
5^{2}x^{2}-13^{2}
Expand \left(5x\right)^{2}.
25x^{2}-13^{2}
Calculate 5 to the power of 2 and get 25.
25x^{2}-169
Calculate 13 to the power of 2 and get 169.
\left(5x\right)^{2}-13^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
5^{2}x^{2}-13^{2}
Expand \left(5x\right)^{2}.
25x^{2}-13^{2}
Calculate 5 to the power of 2 and get 25.
25x^{2}-169
Calculate 13 to the power of 2 and get 169.
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