This expression cannot be simplified, as you cannot add or subtract variables raised to different exponents.
Answer:
Explanation:
6z⁶ - 21z⁴ - 12z² = 2*3*z⁶ - 3*7*z⁴ - 4*3*z²
= 3z² (2z⁴ - 7z² - 4)
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