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6225x^{2}-240x-15296
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6225x^{2}-240x-15296
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225x^{2}-240x+64+\left(5x-8\right)\left(5x+8\right)\times 240
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(15x-8\right)^{2}.
225x^{2}-240x+64+\left(25x^{2}-64\right)\times 240
Use the distributive property to multiply 5x-8 by 5x+8 and combine like terms.
225x^{2}-240x+64+6000x^{2}-15360
Use the distributive property to multiply 25x^{2}-64 by 240.
6225x^{2}-240x+64-15360
Combine 225x^{2} and 6000x^{2} to get 6225x^{2}.
6225x^{2}-240x-15296
Subtract 15360 from 64 to get -15296.
225x^{2}-240x+64+\left(5x-8\right)\left(5x+8\right)\times 240
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(15x-8\right)^{2}.
225x^{2}-240x+64+\left(25x^{2}-64\right)\times 240
Use the distributive property to multiply 5x-8 by 5x+8 and combine like terms.
225x^{2}-240x+64+6000x^{2}-15360
Use the distributive property to multiply 25x^{2}-64 by 240.
6225x^{2}-240x+64-15360
Combine 225x^{2} and 6000x^{2} to get 6225x^{2}.
6225x^{2}-240x-15296
Subtract 15360 from 64 to get -15296.
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