Answer:
17. (3x²+5x-7) (2x)
= (2x) (3x²+5x-7)
= 6x³+10x²-14x
= B
18. 21x³-7x²/-7x
= 3.7.x³-7x²/7x
= -(x(3x-1))
= -3x²+x
= A
19. 9x³-6x²-3x/3x
= 3².x³-2(3)(x²)-3x / 3x
= 3x²-2x-1
20. 18x⁵ / 6x³
= 2(3²)(x⁵) / 2(3)(x³)
= 3x²
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Answers & Comments
Answer:
17. (3x²+5x-7) (2x)
= (2x) (3x²+5x-7)
= 6x³+10x²-14x
= B
18. 21x³-7x²/-7x
= 3.7.x³-7x²/7x
= -(x(3x-1))
= -3x²+x
= A
19. 9x³-6x²-3x/3x
= 3².x³-2(3)(x²)-3x / 3x
= 3x²-2x-1
= A
20. 18x⁵ / 6x³
= 2(3²)(x⁵) / 2(3)(x³)
= 3x²
= B