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

Which value of a would make the expression 5 1/3 ÷ 4/a equivalent to a whole number?
Samba is a form of popular music in Brazil that is a blend of European and African musical traditions and influences. The incorporation of these elements into a
What does Patrick Henry tell the President in this letter is his opinion of what the topic is all about? slavery or deportation freedom or slavery freedom or c
Answer the following question in 3-4 complete sentences. Picture 1: A woman's face. The curls in the hair are drawn with wide strokes and the face is shaded wit
three way in which rate of hydrogen reaction can be interested​
anybody know how to do this ?
Where would the value of the expression below be found on a number line? 4 + |-9 +4| A. At 0 B. Between 0 and 5 C. Between 5 and 10 D. Between -5 and 0 E. Betwe
Using the map above, what number is on the state of North Dakota?
why was anicent Egypt ruled by 31 diffrent dynasties​
does anyone know how i can talk to rick riordan becuase i love his writing