simplify:(5x2 + 8x − 3) (4 x 2 − 2x + 20)

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(5x^2 + 8x - 3)(4x^2 - 2x + 20)
= (5x^2)(4x^2) + (8x)(4x^2) - (3)(4x^2) + (5x^2)(-2x) + (8x)(-2x) + (-3)(-2x) + (5x^2)(20) + (8x)(20) - (3)(20)
= 20x^4 + 32x^3 - 12x^2 - 10x^3 - 16x^2 + 6x + 100x^2 + 160x - 60
= 20x^4 + 22x^3 + 72x^2 + 166x - 60
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