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4 years ago

How to solve f(-3)= -2x^2+5x

Mathematics

2 answers:

Sauron [17]4 years ago

4 0

Replace all the x values with -3

f(-3)=-2(-3)^2+5(-3)
f(-3)=2(9)-15
f(-3)=18-15
f(-3)=3

Hope I helped :)

AleksandrR [38]4 years ago

3 0

Plug -3 in for x. the equation should look like this
f(-3)=-2(-3)^2+5(-3)

simplify by multiplying and you get
f(-3)=6^2-15

now apply the exponent
f(-3)=36-15

finish it off by subtracting and you get
f(-3)=21

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Is 4 gallons smaller than 17 qt?

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Answer:

Yes.

Step-by-step explanation:

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If the discriminant of a quadratic equation is equal to -8, which statement describes the roots?

Dovator [93]

Keywords

quadratic equation, discriminant, complex roots, real roots

we know that

The formula to calculate the roots of the quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}}{2a}$

where

The discriminant of the quadratic equation is equal to

$b^{2}-4ac$

if $(b^{2}-4ac)> 0$ ----> the quadratic equation has two real roots

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if $(b^{2}-4ac)< 0$ ----> the quadratic equation has two complex roots

in this problem we have that

the discriminant is equal to $-8$

the quadratic equation has two complex roots

therefore

the answer is the option A

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3 years ago

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Wittaler [7]

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3 years ago

Can someone please help me with this question??

suter [353]

｡☆✼★ ━━━━━━━━━━━━━━━ ☾

Use this equation:

(difference/original) x 100

Substitute in the values:

(150/450) x 100

Solve:

percentage = 33.333

Thus, the answer is option B

Have A Nice Day ❤

Stay Brainly! ヅ

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3 years ago

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At a football game, 65% of people attending were supporting the home team, while 35% were supporting the visiting team. If 1300

Misha Larkins [42]

Answer: 2000

Step-by-step explanation:

At a football game, 65% of people that will attend are supporting the home team, while 35% are supporting the visiting team. 1300 people that attended supported the home team.

To get the total number of people that attended the game, we have to find the number of away supporters as well.

Let the number of people that attended the game be y.

Therefore 65% of y = 1300

65/100 × y = 1300

0.65 × y = 1300

0.65y = 1300

Divide both side by 0.65

0.65y/0.65 = 1300/0.65

y = 2000

The total number of people attending the game is 2000.

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4 years ago