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15x^{2}-8x+15
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15x^{2}-8x+15
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5x^{2}+15+\left(5x-4\right)\times 2x
Use the distributive property to multiply x^{2}+3 by 5.
5x^{2}+15+\left(10x-8\right)x
Use the distributive property to multiply 5x-4 by 2.
5x^{2}+15+10x^{2}-8x
Use the distributive property to multiply 10x-8 by x.
15x^{2}+15-8x
Combine 5x^{2} and 10x^{2} to get 15x^{2}.
5x^{2}+15+\left(5x-4\right)\times 2x
Use the distributive property to multiply x^{2}+3 by 5.
5x^{2}+15+\left(10x-8\right)x
Use the distributive property to multiply 5x-4 by 2.
5x^{2}+15+10x^{2}-8x
Use the distributive property to multiply 10x-8 by x.
15x^{2}+15-8x
Combine 5x^{2} and 10x^{2} to get 15x^{2}.
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