Question

Solve the following equation
x^4-8x^2-9=0

Answer 1

Answer:

$\huge\bigstar\huge\tt\underline\red{ᴀɴsᴡᴇʀ }\bigstar$

Here is your answer..!!!

${x}^{4} - 8 {x}^{2} - 9 = 0$

${x}^{2} ( {x}^{2} - 8) - 9 = 0$

$({x}^{2} - {3}^{2} )( {x}^{2} - 8) = 0$

${x}^{2} = 9 \: and \: {x}^{2} = 8$

$x = 3 \: and \: x = 2 \sqrt{2}$

Hope it helps you..!!!

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Thankyou:)