Question

a4+16a2-225=0 factors​

Answer 1

Step-by-step explanation:

a^4 + 16a^2 -225 = 0

=> a^4 + 16 a^2 = 225

=> a^2 { a^2 + 16 } = 225

=> a^2 = 225 | a^2 + 16 = 225

a = +15 , -15 | a^2 = 225 - 16

| a^2 = 209

i.e.,

$a \: = 15 \: and \: - 15 \: and \: \sqrt{209}$