All categories

4 years ago

Evaluate f(x) = 5x2 - 4x - 9 for f(-2)

Mathematics

1 answer:

Svetllana [295]4 years ago

8 0

Answer:

Step-by-step explanation:

5x^2 -4x -9

5(-2)^2 -4(-2) -9

-10^2 +8 -9

100-1

You might be interested in

The eastern continental trail is 15 times longer than the Erie canal way trail. The combined length of the hiking trails is 5,76

Lena [83]

The length of eastern continental trail is 5400 miles and length of erie canal trail is 360 miles.

Step-by-step explanation:

Given,

Combined length of both trails = 5760 miles

Let,

x be the length of eatern continental trail.

y be the length of Erie canal trail.

According to given statement;

x+y=5760 Eqn 1

x = 15y Eqn 2

Putting value of x from Eqn 2 in Eqn 1

$15y+y=5760\\16y=5760$

Dividing both sides by 16

$\frac{16y}{16}=\frac{5760}{16}\\y=360\\$

Putting y=360 in Eqn 2

$x=15(360)\\x=5400$

The length of eastern continental trail is 5400 miles and length of erie canal trail is 360 miles.

Keywords: linear equation, substitution method

Learn more about substitution method at:

#LearnwithBrainly

6 0

3 years ago

PLEASE HELP!!!

Artemon [7]

B. T<span>he slope is 10.25. This means that Dante earns $10.25 each hour.

</span>

3 0

3 years ago

A solid cube of side 18 cm is cut into 8 cubes of equal volume what will be the side of the new cube ? Also find the ratio betwe

maks197457 [2]

The volume of the original cube = 18^3 = 5,832 cubic cm

5,832 / 8 cubes = 729 cubic cm.

Side length = Cubicroot729 = 9

The side length is 9 cm

5 0

4 years ago

Read 2 more answers

What are the factors of the polynominal 2x+5x+3

My name is Ann [436]

Answer:

(7x+3)

Step-by-step explanation:

2x+5x+3 is simplified to 7x+3 which is the only factor of this binomial.

8 0

3 years ago

Please i really need help

Hatshy [7]

The last expression: (16-8)x2+4=8x6=48

4 0

4 years ago