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3 years ago

Solve (x + 9)2 = 25.

Mathematics

2 answers:

iren2701 [21]3 years ago

4 0

Answer:

X=-4

X=-14

Step-by-step explanation:

If x= x+9=-5 then you do the subtract 9 from both sides to get x = -14

Marina CMI [18]3 years ago

3 0

Answer:

-4 ; -14

Step-by-step explanation:

x+9 = 5

x = 5-9 = -4

x+9 = -5

x = -5-9 = -14

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Marco purchased a large box of comic books for $300. He gave 15 of the comic books to his brother and then sold the rest on an i

Yuri [45]

Answer: There are 75 books.

Price of each book = $4.

Step-by-step explanation:

Let x = Number of books in the box.

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Cost of x books = $300

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Books left after giving 15 of them = x-15

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Selling price of one book = $\$(\dfrac{330}{x-15})$

Profit on each book= $1.50

Profit = selling price - cost price

$\Rightarrow 1.50=\dfrac{330}{x-15}-\dfrac{300}{x}\\\\\Rightarrow\ 1.50=\dfrac{330(x)-300(x-15)}{x(x-15)}\\\\\Rightarrow\ 1.50=\dfrac{330x-300x+4500}{x^2-15x}\\\\\Rightarrow\ 1.50(x^2-15x)=30x+4500\\\\\Rightarrow\ 1.50x^2-22.5x=30x+4500\\\\\Rightarrow\ 1.50x^2-52.5x-4500=0\\\\\Rightarrow\ 1.50x^2-52.5x-4500=0\\\\\Rightarrow\ x^2-25x-3000=0\ \ [\text{divide by 1.5}]$