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x² + 2x = 80
ordenando
x² + 2x - 80 = 0
x 10
x - 8
x + 10 = 0 v x - 8 = 0
x = - 10 v x = 8
el número es 8
x² + 2x = 80
x² + 2x - 80 = 0
x -8
x 10
10x - 8x = 2x
x + 10 = 0 x - 8 = 0
x = - 10 x = 8
CS = (-10 ; 8)