Expand
25\pi x^{2}-70\pi x+49\pi
Evaluate
\pi \left(5x-7\right)^{2}
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\pi \left(25x^{2}-70x+49\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-7\right)^{2}.
25\pi x^{2}-70\pi x+49\pi
Use the distributive property to multiply \pi by 25x^{2}-70x+49.
\pi \left(25x^{2}-70x+49\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-7\right)^{2}.
25\pi x^{2}-70\pi x+49\pi
Use the distributive property to multiply \pi by 25x^{2}-70x+49.
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