Question

PLZ HELP ME BY THE END OF THE DAY

Lisa solved 3x2 + 1 = 28 as shown. 3x2 + 1 = 28 3x2 = 27 x2 = 9 She concluded that the solutions to this quadratic equation are x = -9 or x = 9. What are the correct solutions to this quadratic and how did you arrive at your answer?

Answer 1

`3x^(2) +1=28`

Step 1 : subtract 1 from both sides

`3x^(2) =27`

Step 2 : Divide both sides by 3

`((3x^(2) )/(3) )/((27)/(3) )`

`x^(2) = 9`

Step 3 : Find the square root of 9

`√(9) = 3`

x= (-3,3)

remember negative × negative = positive