Question

{–½, 2}

{–½, –2}
 {½, 2}
  {½, –2}

 Use the quadratic formula to solve 2y2 – 5y   = –2. 

Answer 1

1/2, 2

Explanation:

i took the test

Answer 2

`2y^2 - 5y =-2\\ \\2y^2 - 5y +2=0\\ \\ a=2 , \ b=-5, \ c=2 \\ \\\Delta =b^2-4ac = (-5)^2 -4\cdot2\cdot 2 = 25-16=9 \\ \\y_(1)=(-b-√(\Delta) )/(2a)=(5-√(9))/(2\cdot 2 )=(5-3)/(4)=(2)/(4)= (1)/(2)`


`y_(2)=(-b+√(\Delta) )/(2a)=(5+√(9))/(2\cdot 2 )=(5+3)/(4)=(8)/(4)= 2\\ \\Answer : \ \left \{ (1)/(2),2 \right \}`