calculer les expressions a=13-2puissanses4 x (5-2x4)exposant2

bonsoir

a = 13 - 2 ⁴ x ( 5 - 2 x 4)²
a = 13 - 16 x ( 5 - 8)²
a = 13 - 16 x - 3²
a = 13 - 16 x 9
a  =13 - 144
a = - 131