1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vsevolod [243]
2 years ago
11

Select the two values of x that are roots of this equation. 2x2 + 7x + 6 = 0

Mathematics
2 answers:
julia-pushkina [17]2 years ago
8 0

Answer:

\large {\textsf{A and C}}\ \implies x_1=-2,\ x_2=-\dfrac{3}{2}}

Step-by-step explanation:

In this problem, we can use two methods to solve for the values of x (roots) of the given equation. Those methods are: using the quadratic formula and factoring.

Standard Form of a Quadratic Equation: ax² + bx + c = 0, where a ≠ 0

<u>Given equation:</u> 2x² + 7x + 6 = 0

⇒ a = 2, b = 7, c = 6

Method 1: Using the Quadratic Formula

<u>Quadratic Formula:</u> x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

<u>Step 1:</u> Substitute the values of <em>a</em>, <em>b</em>, and <em>c</em> into the quadratic formula.

\implies x=\dfrac{-7\pm\sqrt{7^2-4(2)(6)}}{2(2)}\\\\

<u>Step 2:</u> Simplify

\implies x=\dfrac{-7\pm\sqrt{\bold{7^2}-4(2)(6)}}{\bold{2(2)}}\\\\\implies x=\dfrac{-7\pm\sqrt{49-4\bold{(2)(6)}}}{4}\\\\\implies x=\dfrac{-7\pm\sqrt{49\bold{-4(12)}}}{4}\\\\\implies x=\dfrac{-7\pm\sqrt{\bold{49-48}}}{4}\\\\\implies x=\dfrac{-7\pm\sqrt{\bold{1}}}{4}\\\\\implies x=\dfrac{-7\pm1}{4}

<u>Step 3:</u> Separate into two possible cases and solve for the values of x.

\implies x_1=\dfrac{-7-1}{4}\implies \dfrac{-8}{4}\implies \boxed{-2}\\\\\implies x_2=\dfrac{-7+1}{4}\implies \dfrac{-6}{4}\implies\boxed{-\dfrac{3}{2}}

Method 2: Solve by Factoring

In order to be able to solve this equation by factoring, let's rewrite the <em>middle term</em> by finding the factors that give a product of the first and last terms (a • c = 12) and give us the sum of the middle term (b = 7).

Factors that give a product of a • c: <em>4 • 3</em> = 12

Factors that give a sum of b: <em>4 + 3</em> = 7

<u>Step 1:</u> Rewrite the given equation with those factors.

2x² + 7x + 6 = 0

⇒ 2x² + 4x + 3x + 6 = 0

<u>Step 2:</u> Factor out 2x and 3.

(2x² + 4x) + (3x + 6) = 0

⇒ 2x(x + 2) + 3(x + 2) = 0 [ Factor out the the common factor. ]

⇒ (2x + 3)(x + 2) = 0

<u>Step 3:</u> Apply the <em>Zero-Product Property</em> (if m•n = 0, then m = 0 or n = 0).

a) 2x + 3 = 0 ⇒ 2x = -3 ⇒ x = -³⁄₂

b) x + 2 = 0 ⇒ x = -2

Therefore, the two roots of this equation are x = -³⁄₂ and x = -2.

Learn more about quadratic equations here:

brainly.com/question/27989834

brainly.com/question/27638369

Anna007 [38]2 years ago
7 0

Answer:

x = -3/2, -2

Step-by-step explanation:

2x^2 + 7x + 6 = 0

(2x + 3)(x + 2) = 0

(2x + 3)

2x = -3

x = -3/2

(x + 2)

x = -2

You might be interested in
Simplify each expression
Hatshy [7]

Answer:

<h3>3. \:  \: ( \frac{7}{8} ) ^{2}  =  \frac{ {7}^{2} }{ {8}^{2} }  =  \frac{49}{64}  = 0.765</h3>

5. \:  \: 8 + 5(7) = 8 + 35 = 43

I hope I helped you^_^

3 0
3 years ago
What does a regulatory buoy with a diamond symbol indicate?
mina [271]
A regulatory buoy with a diamond symbol indicates danger from rock, shoal, wreck etc. Hope this helps!
7 0
3 years ago
Need help on 1 and 2 plzzz help !!!!!
Vesna [10]
Subtract 1 to 13. so you got 12. divide 4 so you can get the S by it self.S=3.
6 0
3 years ago
Read 2 more answers
Solve: 3(2d - 1) – 2d = 4(d– 2) + 5
FrozenT [24]

<em>The</em><em> </em><em>right</em><em> </em><em>answer</em><em> </em><em>is</em><em> </em><em><u>No</u></em><em><u> </u></em><em><u>solution</u></em><em><u>.</u></em>

<em><u>Look</u></em><em><u> </u></em><em><u>at</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>attached</u></em><em><u> </u></em><em><u>picture</u></em>

<em><u>Hope</u></em><em><u> </u></em><em><u>it</u></em><em><u> </u></em><em><u>will</u></em><em><u> </u></em><em><u>help</u></em><em><u> </u></em><em><u>you</u></em>

6 0
3 years ago
Which of the following is the solution
Valentin [98]

The smallest the absolute value will ever be is zero so the left side won't ever be smaller than -2 so won't ever be less than -3.


D. No solution


4 0
3 years ago
Read 2 more answers
Other questions:
  • Hall Construction Company signed a contract with a customer for the construction of a new $ 500,000 warehouse. At the signing, H
    6·1 answer
  • Can you help me ( 25 points) asap
    6·2 answers
  • Solve (X-3)^2/3=9 (the ^ is an exponent)
    5·1 answer
  • Brian is fencing a rectangular area in the backyard for his dog. He has 25 ft of fence. He does not need fencing on the side tha
    14·1 answer
  • A soccer field is a rectangle 90 meters wide and 120 meters long. The coach asks the players to run from one corner to the corne
    5·1 answer
  • Find the surface area of the prism below. See attachment, 58 cm is incorrect.
    11·2 answers
  • HELP please, will give brainliest​
    15·2 answers
  • A recreational court is twice as long as it is wide. If the perimeter is 210 ft, find the dimensions of the court.
    10·1 answer
  • If f(x) = x/2 -3 and g(x) = 3x2 +x-6 find (f+g) (x)
    11·1 answer
  • Henry says that his set of numbers includes all integers. Iliana argues that he is wrong.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!