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gregori [183]
3 years ago
10

Help me please!!! i need help

Mathematics
1 answer:
katen-ka-za [31]3 years ago
3 0

Answer:

Step-by-step explanation:

P = 1800 + 700x - 100x²

Find x when p = $2,800

2,800 = 1800 + 700x - 100x²

- 100x² + 700x + 1800 - 2800 = 0

-100x² + 700x - 1000 = 0

- x² + 7x - 10 = 0

a = -1

b = 7

c = -10

x = -b ± √b² - 4ac / 2a

x = -7 ± √7² - 4(-1)(-10) / 2(-1)

= -7 ± √49 - 40 / -2

= -7 ± √9 / -2

= -7 ± 3 / -2

= (-7 + 3) / -2 or (-7 - 3) / -2

= -4 / -2 or -10 / -2

x = 2 or 5

x = 2 items for smaller value

x = 5 items for larger value

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