f(x) = -4x²
f(4x⁴) = -4 · (4x⁴)² = -4 · 16x⁸ = -64x⁸
f(4x^4)= -4(4x^4)²=-4·16x^8= -64x^8.
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f(x) = -4x²
f(4x⁴) = -4 · (4x⁴)² = -4 · 16x⁸ = -64x⁸
f(4x^4)= -4(4x^4)²=-4·16x^8= -64x^8.