solve using appropriate identity
x⁴-81
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Answered by
4
==>(x²)² - (3²)²
==> (x²+3²)(x²-3²)
==> (x²+3²) [(x-3) (x+3)]
hope it helps you friend!
Answered by
1
Step-by-step explanation:
By the formula a²-b² = (a+b) (a-b)
x⁴-81 = (x²+9)(x²-9)
= (x²+9)(x+3)(x-3)
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