Question

¿Cuál es la expresión que representa el volumen de la pieza cúbica hueca?
A. 2 (3m2 + 1)
B. 3 (2m2 - 3)
C.(m - 1)2 (m +1)
D.(m2 +1) (m - 1)(m + 1)​

Answer 1

2(3m2+1)

=(2)(3m2+1)

=(2)(3m2)+(2)(1)

=6m^2+2

3(2m2−3)

=(3)(2m2+−3)

=(3)(2m2)+(3)(−3)

=6m2−9

(m−1)(2)(m+1)

=((m−1)(2))(m+1)

=((m−1)(2))(m)+((m−1)(2))(1)

=2m2−2m+2m−2

=2m2−2

(m2+1)(m−1)(m+1)

=((m2+1)(m−1))(m+1)

=((m2+1)(m−1))(m)+((m2+1)(m−1))(1)

=m4−m3+m2−m+m3−m2+m−1

=m4−1