All categories

3 years ago

Solve g(-1)=x^2-5x+2

Mathematics

1 answer:

olga55 [171]3 years ago

5 0

Answer:

x = 5/2 + sqrt(17)/2 or x = 5/2 - sqrt(17)/2

Step-by-step explanation:

Solve for x:

x^2 - 5 x + 2 = 0

Subtract 2 from both sides:

x^2 - 5 x = -2

Add 25/4 to both sides:

x^2 - 5 x + 25/4 = 17/4

Write the left hand side as a square:

(x - 5/2)^2 = 17/4

Take the square root of both sides:

x - 5/2 = sqrt(17)/2 or x - 5/2 = -sqrt(17)/2

Add 5/2 to both sides:

x = 5/2 + sqrt(17)/2 or x - 5/2 = -sqrt(17)/2

Add 5/2 to both sides:

Answer: x = 5/2 + sqrt(17)/2 or x = 5/2 - sqrt(17)/2

You might be interested in

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

8090 [49]

Answer:

tanΘ = - $\frac{12}{5}$

Step-by-step explanation:

Using the trigonometric identities

• sin²x + cos²x = 1, hence

cosx = ± √(1 - sin²x )

• tanx = $\frac{sinx}{cosx}$

given sinΘ = $\frac{12}{13}$ , then

cosΘ = ± $\sqrt{1-(12/13)^2}$

Since Θ is in the second quadrant where cosΘ < 0, then

cosΘ = - $\sqrt{1-\frac{144}{169} }$

= - $\sqrt{\frac{25}{169} }$ = - $\frac{5}{13}$

tanΘ = $\frac{\frac{12}{13} }{\frac{-5}{13} }$

= $\frac{12}{13}$ × - $\frac{13}{5}$ = - $\frac{12}{5}$

5 0

2 years ago

6x – 7y = 25<br> 15x+3y = 42

Dmitrij [34]

The answer would =-1

8 0

2 years ago

Evaluate f(3) for the piecewise function: f(x) = Which value represents f(3)? –11 8 12.5 16

Nonamiya [84]

Hello!

-3x-2=-3(3)-2=-9-2= -11
Therefore, The Correct Answer would be 100%:

"-11", Option "A".

I Hope my answer has come to your Help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead! :)

9 0

3 years ago

Read 2 more answers

Sorry theres 3 more after this its all urgent

faust18 [17]

Answer:

Step-by-step explanation:

I just took the quiz

6 0

3 years ago

What is the best estimate for 59.87 - 42.1? A. 18 B. 22 C. 25 D. 30

Sedaia [141]

Answer:

do you still need help on tge questio ?

3 0

3 years ago