Evaluate
\frac{\left(7-15x\right)^{2}}{25}
Expand
9x^{2}-\frac{42x}{5}+\frac{49}{25}
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9x^{2}-\frac{42}{5}x+\frac{49}{25}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-3x+\frac{7}{5}\right)^{2}.
9x^{2}-\frac{42}{5}x+\frac{49}{25}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-3x+\frac{7}{5}\right)^{2}.
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