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shepuryov [24]
3 years ago
7

Find the root 2x2 + x-4 = 0

Mathematics
1 answer:
Aneli [31]3 years ago
7 0

Answer:4

Step-by-step explanation:

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F(x)=2x-1<br> g(x)=3<br> h(x)=x²+1<br><br> Compute the following:<br> Find f(3)
inn [45]
If f(x)=2x-1 just plug in the 3 where x is. So it would be 2(3)-1=5
6 0
2 years ago
I need help with these questions ( see image for question ).<br>Please show working.<br>​
antiseptic1488 [7]

Answer:

  • k = -4 ± 2√5

Step-by-step explanation:

#22

<h3>Given </h3>
  • Equation x² -4x + 1 = k(x - 4) with equal roots
<h3>To find</h3>
  • The value of k
<h3>Solution</h3>

<u>The equation in standard form is:</u>

  • x² -4x + 1 = k(x - 4)
  • x² - 4x - kx + 1 + 4 = 0
  • x² - (k + 4)x + 5 = 0

<u>When the quadratic equation has equal roots its discriminant is zero</u>

  • D = 0
  • b² - 4ac = 0
  • (k + 4)² - 4*5 = 0
  • (k + 4)² = 20
  • k + 4 = ± √20
  • k = - 4 ± √20
  • or
  • k = -4 ± 2√5
5 0
2 years ago
The rectangular prism shown has a surface area of 488 square inches. What is the length of the prism?
BigorU [14]

Answer:

length of the prism = 244 - (width x height) / width + height)

Step-by-step explanation:

Let length be a and width be b and height be c

2 (a * b) + 2 (b* c) + 2 (a * c) = 488

2ab+ 2bc + 2ac = 488

ab + bc + ac = 244

ab + ac = 244 - ac

a (b + c) = 244-ac

a = 244-bc / b + c

Therefore the length of the prism = 244 - (width x height) / width + height)

8 0
3 years ago
4/9 divided by what equals 12
NeX [460]
(4/9)/x = 12
(4/9) = 12x
Divide both sides by 12
(1/27) =x
7 0
2 years ago
Read 2 more answers
Please answer 100 points and brainliest
Molodets [167]

Answer: you have to do in the first one 8,16,4,2,11,13,14

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
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