Question

2: Solve for x: 2x 2= 4x + 8

Answer 1

2x-4x=8-2
-2x=6
X=6/-2
X=-3

Answer 2

Step-by-step explanation:

2x^2 - 4x - 8 = 0

x^2 - 2x - 8 =0

$x = 2 ( - )(+) \sqrt{2 {}^{2} + 4.1.4 } \div 2.1 \\ x = 2( + )( - ) \sqrt{4 + 16} \div 2 \\ x = 2( - )( + ) \sqrt{20} \div 2 \\ x = 2( - )( + )2 \sqrt{5} \div 2 \\ x = 2(1( - )( + ) \sqrt{5} \div 2 \\ thefore \: x = 1 + \sqrt{5} \: or \: x = 1 - \sqrt{5}$