Question

what are the roots of the quadratic equation
$\sqrt{2x {}^{2} + 9 } = 9$
A)6, -6
B)3,-3
C)2,-2
D)6,0​

Answer 1

$\sqrt{2 {x}^{2} + 9 } = 9 \\ 2 {x}^{2} + 9 = 81 \\ 2 {x}^{2} = 72 \\ {x}^{2} = 36 \\ x = + 3 \: \: and \: - 3$
Hence option B.

Answer 2

Answer:

Step-by-step explanation: