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Subtract and simplify: (13x^2 + 2) - (4x^2 + 2x - 7)


A) 9x^2 - 2x + 9
B) 9x^2 + 2x + 9
C) 17x^2 + 2x - 5
D) 9x^2 - 2x - 5

Respuesta :

(13x² + 2) - (4x² + 2x - 7) = 
13x² + 2 - 4x² - 2x + 7 = 
9x² - 2x + 9
(13x^2 + 2) - (4x^2 + 2x - 7)=

13x^2 + 2 - 4x^2 - 2x +7=
9X^2-2X+9 (A)