What am I doing wrong?

Problem: 2x^2(5x^2-1x-4)

Answer: 10x^4-2x^3-8^2

2 answers

The answer is correct.
Don't know what you did until you posted your work.
2 x ^ 2 ( 5 x ^ 2 - 1 x - 4 ) =

( 2 x ^ 2 * 5 x ^ 2 ) - ( 2 x ^ 2 * 1 x ) - ( 2 x ^ 2 * 4 ) =

10 x ^ 4 - 2 x ^ 3 - 8 x ^ 2
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