Question

Tc + sc - td - sd = ?

A) tscd
B) (t + s)(c - d)
C) (t - s)(c - d)
D) (t - s)(c - d)

(its not A)

Answer 1

tc + sc - td - sd = ?

tc-td + sc -sd

t(c-d) +s(c-d)

factor out the c-d

(c-d)(t+s)

Choice B