Question

-12+3(-3+7)= -18

(-4).x² + 1= -15

(2x³+5)-7= -18

Answer 1

b: =>-4x^2=-16

=>x^2=4

=>x=2 hoặc x=-2

c: =>2x^3-2=-18

=>2x^3=-16

=>x^3=-8

=>x=-2