factorise x^4+28x^2-128
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Answer:
x⁴+28x²-128
= x⁴+32x²-4x²-128
=x²(x²+32)-4(x²+32)
= (x²+32)(x²- 4)
=(x²+32)(x-2)(x+2)
Answered by
1
answer is :(x^2+32)(x-2)(x+2)
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