Evaluate
8\left(3-5x\right)^{2}+21
Expand
200x^{2}-240x+93
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8\left(25x^{2}-30x+9\right)+21
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-5x+3\right)^{2}.
200x^{2}-240x+72+21
Use the distributive property to multiply 8 by 25x^{2}-30x+9.
200x^{2}-240x+93
Add 72 and 21 to get 93.
8\left(25x^{2}-30x+9\right)+21
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-5x+3\right)^{2}.
200x^{2}-240x+72+21
Use the distributive property to multiply 8 by 25x^{2}-30x+9.
200x^{2}-240x+93
Add 72 and 21 to get 93.
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