Question

add 5x2+7y-6z2,4y+3x2,9x2+2z2-9y and 2y-2x2​

Answer 1

Answer:

$15 {x}^{2} + 4y - 4 {z}^{2}$

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Answer 2

Answer

14x power 2 + 2y - 4z power 2