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3 years ago

Write an equivalent expression for (x - 11)(x + 9).

Mathematics

1 answer:

vodka [1.7K]3 years ago

7 0

Answer:

x²-2x-99

Step-by-step explanation:

(x-11)(x+9) - foil method

x times x = x squared

x times 9 = 9x

-11 times x = -11x

-11 times 9 = -99

x squared + 9x + 11x + -99

x squared-2x-99

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Which of these is NOT an integer

Tema [17]

Hi there!

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I believe your answer is:

Option A

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Here’s why:

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$\boxed{\text{Option A:}}\\\\3^{-5}\\\\\rightarrow \frac{1}{3^5}\\\\\rightarrow \frac{1}{243}\\\\\ \text{This is \textbf{NOT} an integer.}}$

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$\boxed{\text{Option B:}}\\\\-3^5\\\\\rightarrow -3 * -3 * -3 * -3 * -3 \\\\\rightarrow \boxed{-243}\\\\\\\text{This \textbf{IS} an integer.}$

⸻⸻⸻⸻

$\boxed{\text{Option C:}}\\\\\frac{1}{3}^{-5} \\\\\rightarrow \frac{1}{(\frac{1}{3})^5}\\\\\rightarrow \frac{1}{\frac{1}{243} }\\\\\rightarrow \boxed{243}\\\\\\\text{This \textbf{IS} an integer.}$

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$\text{Option \textbf{A} does not simplify into an integer.}$

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Hope this helps you. I apologize if it’s incorrect.

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3 years ago

I need help with #13

iren2701 [21]

B) m= 1/2
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3 years ago

For what real number k does the product (25 + ki)(3+2i) equal a real number?

pochemuha

Hello :
<span>(25 + ki)(3+2i) = 75+50i +3ki -2k = (75-2k) +i (3k+50)
</span><span>the product (25 + ki)(3+2i) equal a real number: 3k +50 = 0
</span>k = -50/3

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3 years ago

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Ksenya-84 [330]

Answer:

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Step-by-step explanation:

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3 years ago

Read 2 more answers

Justin weighs 15 pounds less than Greg weighs. Half of Greg's weight is 75 pounds less than Justin's weight. How much does each

solniwko [45]

Answer:

justin = 135 & greg = 150

Step-by-step explanation:

equations:

(justin is 15lbs under greg) j-15=g

(find gregs full weight by doubling bc the problem gave you half) 75*2=150

(plug in gregs wieght to find justins weight) j-15=150 -> j=135

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3 years ago