Con procedimiento porfa :D
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x^2 - 9 + 49 - x^2
x^2 - x^2 = 0
49 - 9 = 40
R= 40
(x + 2y)^2 - (x - 2y)^2
x^2 + 4y^2 - (x^2 + 4y^2)
x^2 + 4y^2 - x^2 - 4y^2
x^2 - x^2 = 0
4y^2 - 4y^2 = 0
R= 0
(2x + 1) (2x - 1) + (3 + x) (x - 3)
4x^2 -1 + (-9 + x^2)
4x^2 -1 - 9 + x^2
R= 5x^2 -10