Question

Efectúa:
C=(x+9)(x-9)-x2
a)x
b)-18x-81
c)-81
d)-80

Answer 1

Explicación paso a paso:

$(x + 9)(x - 9) - {x}^{2} \\ {x}^{2} - {9}^{2} - {x}^{2} \\ - {9}^{2} \\ - 81$