Answer:
3x^2
Explanation:
-4x^2 +7x^2
You simply just have to add them because they have the same root and are both cubed as well as the same variable "x".
-4x^2 + 7x^2 = 7x^2 - 4x^2 = x^2 * (7 - 4) = x^2 * 3 = 3x^2
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