Respuesta :
Answer:
2.87
Step-by-step explanation:
2x^2-7=9
2x^2=9+7
2x^2/2=16/2
(square root)x^2=(square root)8
x=2.87
I used this method because I don't know any other method.
Answer:
Sample Response: I would use the square root property of equality. Because there is no x term, I would just add and divide to get x^2 by itself. Then I would take the square root.
2x^2 - 7 = 9
2x^2 - 7 + 7 = 9 + 7
2x^2 = 16
2x^2/2 = 16/2
x^2 = 8 (square root of 8 would be square root of 4*2 = 2*square root of 2
x = +/- 2*square root of 2
