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Which of these is the highest common factor of the polynomials, 10 (x2 + 5x + 4), 15 (x2 - 3x - 4) and 20 (x2 + 2x + 1)?
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Answer:
(3x
2
−5)(4+4x
2
)=3x
2
(4)−5(4)+3x
2
(4x
2
)−5(4x
2
)=12x
2
−20+12x
4
−20x
2
=12x
4
−8x
2
−20
The coefficient of x
2
in this is −8
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