kaihalojr
kaihalojr kaihalojr
  • 01-05-2018
  • Mathematics
contestada

Solve.
2x^2 + x - 1 = 2
A 1,2
B No real solutions
C 1,-3/2
D x = (-1 plus minus 3) over 2

Respuesta :

gmany
gmany gmany
  • 29-07-2018

[tex]2x^2+x-1=2\ \ \ |-2\\\\2x^2+x-3=0\\\\2x^2+3x-2x-3=0\\\\x(2x+3)-1(2x+3)=0\\\\(2x+3)(x-1)=0\iff 2x+3=0\ \vee\ x-1=0\\\\2x+3=0\ \ |-3\\2x=-3\ \ \ |:2\\x=-\frac{3}{2}\\\\x-1=0\ \ \ |+1\\x=1[/tex]

Answer: C 1, -3/2

Answer Link

Otras preguntas

Joe's computer crashed and I was looking for a replacement which of the following criteria is less important.Ram,money, color, usage ​
Students are planning the backdrop for the school play. The backdrop is 15 feet wide and 10 feet high. Every 16 inches on the scale drawing represents 5 feet on
what is the term for a membrane-enclosed structure within a cell that performs a specific function?
Can somebody help me with this it is a science question part #2 ( can you also check my other questions to see if you can answer them).
what is the value of eight to the power of 0
Jackie is 5 years old. She has been diagnosed with ADHD and shows signs of learning problems. Her pediatrician suggests that Jackie's problems could be the resu
It's looking for the solved answer, not the simplified expression (no variable in final answer)
You leave your home at 1pm. At 3pm, you are 100 km east of your house. What was your average velocity in km/hr
how many hours is 1,373 minutes?
Calculate the average atomic mass of boron (B), which has two isotopes: B-10 with 19.9% natural abundance, and B-11 with 80.1% abundance. Average atomic mass of