Question

what should be added to 3x² + 4 to get 9x² -3​

Answer 1

Let the expression that needs to be added be 'A'

A + 3x^2 + 4 = 9x^2 - 3

A = 9x^2 -3 -3x^2 -4

A = 6x^2 -7

So 6x^2 -7 should be added