Math, asked by gudd11october, 1 year ago

factorise a^4-20a^2+8

Answers

Answered by mysticd
0
Hi ,

a⁴ - 20a² + 8

= ( a² )² - 2 × a² × 10 + 8

= ( a² )² - 2 × a² × 10 + 10² + 8 - 10²

= ( a² - 10 )² + 8 - 100

= ( a² - 10 )² - 92


= ( a² - 10 )² - ( √ 92 )²

= ( a² - 10 + √92 ) ( a² - 10 - √ 92 )

I hope this helps you.

: )
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