Answer:
5x^2 - 4x - 1 + 4x^2 + 4
9x^2 - 4x + 3
Step-by-step explanation:
[tex](5x^2-4x-1)-(-4x^2-4)[/tex]
[tex](5x^2-4x-1) + (4 {x}^{2} + 4)[/tex]
[tex]5x^2-4x-1 + 4 {x}^{2} + 4[/tex]
[tex]( {5x}^{2} + {4x}^{2} ) + ( - 4x) + ( - 1 + 4)[/tex]
[tex] {9x}^{2} - 4x + 3[/tex]
