10s^3 + 25s^2 +8s +20 factor this expression with work?

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Which shows the correct substitution of the values a, b and c from the equation 1=-2x+3x^2+1

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