Question

in the product of (2-x) (5-3x) (1-7x), find the coefficient of x^2

Answer 1

Answer:

80

Step-by-step explanation:

(2-x)(5-3x)(1-7x)

(10-6x-5x+3x²)(1-7x)

10-6x-5x+3x²-70x+42x²+35x²-21x³

-21x³+80x²-76x+10=0

coefficient of x²=80

Answer 2

Answer:

80

Step-by-step explanation:

(2 - x) (5 - 3x) (1 - 7x)

(10 - 6x - 5x + 3x²) (1 - 7x)

10 - 6x - 5x + 3x² - 70x + 42x² + 35x² - 21x³

- 21x³ + 80x² - 76x + 10 = 0

Coefficient of x² = 80

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