ed3g3irlmadion ed3g3irlmadion
  • 05-01-2017
  • Mathematics
contestada

Can someone check my answer:

What is the solution set to x^2 = 6x + 27?

A. (-9, -3)
B. (-3, 9)
C. (9, -3)
D. (3, 9)

My answer: B. (-3, 9)

Respuesta :

apologiabiology
apologiabiology apologiabiology
  • 05-01-2017
minus 6x+27 both sides
x^2-6x-27=0
factor
what 2 numbers multiply to get -27 and add to get -6
-9 and 3
(x-9)(x+3)=0
set to zero
x-9=0
x=9

x+3=0
x=-3

x=9 and -3
C or B is the answer, they are the same, just switched
if there is some new way of doing it, I don't konw
I would pick B
Answer Link

Otras preguntas

Use a vertical format to subtract the polynomials. 7x2 - 7x + 1 - (10x2 + 9x – 5)
the following from least to greatest. 64%, 1_5 0.567
. Because the legislature seemed so dominant, Madison understood that the great challenge facing republican constitutionalism involved finding ways to modify or
It's 4:45. Son las cinco ____ cuarto.
31 Describe any FIVE visual aids that you would your plan​
6. Discuss/Explain how the 45-45-90 and 30-60-90 triangles laid the foundation for a discussion of similar triangles.
How do I regroup the addends for associative property (5 + 6) + (4 + 7) + 3
math help, please! cannot do the last one
what is the meant by gross reading
If an object is projected horizontally from a height of 5 m with an initial velocity of 7 m/s, what is the value of x0?x0=0x0=7x0=−9.8 m/sx0=5