To simplify the expression, we can distribute the terms:
4I - 5y(3y + 2I) - z(4yI)
= 4I - (5y * 3y) - (5y * 2I) - (z * 4yI)
= 4I - 15y^2 - 10yI - 4yzI
After simplifying, we can rearrange the terms:
= -15y^2 + 4I - 10yI - 4yzI
So the simplified expression is -15y^2 + 4I - 10yI - 4yzI.
4I-5y(3y+2I)-z(4yI)
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