Answer:
Step-by-step explanation:
6z⁶ - 21z⁴ - 12z² = 2*3*z⁶ - 3*7*z⁴ - 4*3*z²
= 3z² (2z⁴ - 7z² - 4)
This expression cannot be simplified, as you cannot add or subtract variables raised to different exponents.
give the question and I will try if I couldn't srry
52.7 degrees fahrenheit