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
Solnce55 [7]
3 years ago
14

Pls only do this if yk it because i’m giving correct answer brainliest! :))

Mathematics
2 answers:
Alona [7]3 years ago
7 0

Answer:

x=4.3, x=-0.3

Step-by-step explanation:

4x^2-16x-26=-21

add 21 to both sides

4x^2-16x-26+21=-21+21

simplify

4x^2-16x-5=0

solve using the quadratic formula

a=4, b=-16, c=-5

x=-(-16)±√(-16)^2-4·4(-5)/2(4)

(solve using a calculator or using order of operations)

(solve for both - and +)

x=4.3, x=-0.3

Leno4ka [110]3 years ago
6 0

Answer:

x=2+\frac{1}{2}\sqrt[]{21}

or

x=2-\frac{1}{2}\sqrt{{21}

Step-by-step explanation:

4x^2-16x-26=-21

Add 21 on both sides.

4x^2-16x-26+21=-21+21

4x^2-16x-5=0

a=4

b=-16

c=-5

x=\frac{-b\frac{+}{}\sqrt[]{b^2-4ac}  }{2a}

x=\frac{-(-16)\frac{+}{}\sqrt[]{(-16)^2-4(4)(-5)}  }{2(4)}

x=\frac{16\frac{+}{}\sqrt[]{256+80}  }{8}

x=\frac{16\frac{+}{}\sqrt[]{336}  }{8}

x=\frac{16\frac{+}{}\sqrt[]{2^2*2^2*21}  }{8}

x=\frac{16\frac{+}{}2*2\sqrt[]{21}  }{8}

x=\frac{16\frac{+}{}4\sqrt[]{21}  }{8}

---------------------------------------------------------------------------

x=\frac{16}{8}+\frac{4\sqrt[]{21}}{8}

x=2+\frac{1}{2}\sqrt[]{21}

---------------------------------------------------------------------------

x=\frac{16}{8}-\frac{4\sqrt[]{21}}{8}\\x=2-\frac{1}{2}\sqrt{{21}

You might be interested in
Find the sum.<br> 7/30 + 9/20 PLS
e-lub [12.9K]

Answer:

41/60

Step-by-step explanation:

Convert the fractions into like denominators: 7/30 = 140/600, 9/20 = 270/600

Add: 140/600+270/600 = 410/600

Divide into a smaller fraction: 41/60

3 0
3 years ago
Here are two steps from the derivation of the quadratic formula<br> second step?<br> Help bro
Andrews [41]
I think it might be C
6 0
3 years ago
Which shows two expressions that equivalent ​
AveGali [126]

Answer:

Option A is the answer...

-7*-15*-5=-525

-7*-75=-525

-1*525=-525

6 0
3 years ago
You are studying for your final exam of the semester. up to this point,you recieved 3 exam scores of 83%,85%, and 84%. to reciev
tamaranim1 [39]
<span>[68,100]

This will allow you to get a B score.

To solve find the medium by adding the values divided by 4, solve for the unknown of the final exam, with the minimum value equalling 80, this will give you 68.</span>
8 0
3 years ago
Read 2 more answers
If the Greatest Common Factor of L and M is 6, write the expression for the Least Common Multiple of these numbers.
zhuklara [117]

Answer:  

\frac{(L x M)}{6}

Step-by-step explanation:  

The greatest common factor is the greatest number that will divide two values. We have two values L and M. Each has numbers which multiply together to give the number. The highest value or most in common they share is 6. This is the GCF.

The least common multiple is the smallest positive number which is a multiple of the two. This means both L and M divide into it evenly.

We know L x M is a multiple because L and M will be factors of it. But we don't know its the least.

As an example if L= 42 and M = 60, they have GCF 6. We can multiply them to find a multiple 42 x 60 = 2520 but we don't know this is the smallest or least multiple we can find. If we divide by the GCF, 2520/6=420. Interestingly, 42 x 10 =420 and 60 x 7 =420. This means 420 is the least common multiple.  

We can multiply (L x M) and then divide by the GCF of L & M to find the least common multiple.

\frac{(L x M)}{6}


7 0
3 years ago
Other questions:
  • Any line with no slope is parallel to the<br><br> *x-axis<br> *y-axis<br> *line y = x
    7·1 answer
  • What is a number n is at least 4
    8·1 answer
  • Five students equally share 1/2 of a pizza.How much of a whole pizza did each student eat
    12·1 answer
  • What is 6×7 broken apart
    8·1 answer
  • Translate the phrase to an algebraic expression.
    7·2 answers
  • The red team scored 4 goals. The blue team scored 3 times as many goals.How many goals did the blue team score?
    9·2 answers
  • Use Euler's Method with h = 0.1 and y(0) = 1 to approximate y(0.3) for the differential equation y ' = -xy. (2 points)
    8·1 answer
  • 1726 rounded to the nearest 100
    6·2 answers
  • Watch help video
    12·1 answer
  • What is the vertex of the parabola defined by the equation
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!