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3 years ago

If –1 is a root of f(x), which of the following must be true?

2 answers:

7 0

The correct answer is that a factor of f(x) is (x+1)

This is due to the zero product property, which states that if two binomials multiply to 0, then one of its factors must equal 0.

(x+1) must equal 0.
(x+1)=0
x=-1

If (x-1)=0, then x would equal 1 instead of -1 which is what the question is asking for.

dolphi86 [110]3 years ago

3 0

Answer:

The answer is B on edg

Step-by-step explanation:

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3 years ago

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3 years ago

Including a 5% sales tax, an inn charges $231 per night. Find the inn's nightly cost before the tax is added

Kamila [148]

The inn's per night cost before tax is $220.

Step-by-step explanation:

Given,

Sales tax = 5% = $\frac{5}{100} = 0.05$

Per night charges including sales tax = $231

Let,

x be the per night charges.

Per night charges + 5% sales tax of per night = 231

$x+0.05x=231\\1.05x=231\\$

Dividing both sides by 1.05

$\frac{1.05x}{1.05}=\frac{231}{1.05}\\x=220$

The inn's per night cost before tax is $220.

Keywords: linear expression, addition

Learn more about addition at:

#LearnwithBrainly

5 0

3 years ago

The elevation of Mt. Everest is 29,028 feet. The elevation of the Dead Sea is -485 feet. What is the difference in the elevation

evablogger [386]

The answer to this question is 29,513

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3 years ago

Team A and Team B play in a competition.

Naily [24]

Team A and Team B play in a competition.

Team A has twelve more points than Team B.

Team A has five times as many points as Team B.

How many points does each team have?

<h3><u>Answer:</u></h3>

Team A has 15 points and Team B has 3 points

<h3><u>Solution:</u></h3>

Given that Team A and Team B play in a competition

Let "a" represent points of team A

Let "b" represent points of team B

Given that Team A has twelve more points than Team B

So we can frame a equation as:

points with team A = 12 + points with team B

a = 12 + b --- eqn 1

Also given that Team A has five as many points as Team B

So we can frame a equation as:

points with team A = 5(points with team B)

a = 5b --- eqn 2

Substitute eqn 2 in eqn 1

5b = 12 + b

4b = 12

b = 3

Therefore from eqn 2,

a = 5b = 5(3) = 15

Thus team A has 15 points and Team B has 3 points

3 0

3 years ago