peanutdadon
peanutdadon peanutdadon
  • 15-11-2019
  • Mathematics
contestada

Which equation shows the quadratic formula used correctly to solve 7x2 = 9+ x for x?

Respuesta :

zrh2sfo
zrh2sfo zrh2sfo
  • 16-11-2019

Answer:

x = (1 + sqrt(253))/14 or x = (1 - sqrt(253))/14

Step-by-step explanation:

Solve for x:

7 x^2 = x + 9

Subtract x + 9 from both sides:

7 x^2 - x - 9 = 0

x = (1 ± sqrt((-1)^2 - 4×7 (-9)))/(2×7) = (1 ± sqrt(1 + 252))/14 = (1 ± sqrt(253))/14:

Answer: x = (1 + sqrt(253))/14 or x = (1 - sqrt(253))/14

Answer Link
optimisiticlana
optimisiticlana optimisiticlana
  • 31-07-2020

This can also be explained as D on edg :)

Answer Link

Otras preguntas

How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance?
Julia has $80. She wants to purchase a nail paint set for $16 ans earrings. She spends the rest of the money on earrings. Each pair of earrings cost $8. Write a
Choose the graph of the function given below.f(x) = 2x+1
what is the cosine of 300 degrees?
3. Factor. 9x2 + 15x (Points : 1)       x(3x + 5)       3x(3x + 5)       9x(x + 5)       3x2(3x + 5) Question 4. 4. Factor. 20mn − 30m (Points : 1)       2m
Why were Motte and Bailey castles replaced by stone castles?
Graph the line for this problem:    y=3x+6
Not sure how to solve 2sinxcosx+cosx=0  Could you help?
how do you classify the slope of a line ?
What is the annotations for the book The Giver