Question

If A=[1−123] and B=[2110] prove that (A+B)2≠A2+2AB+B2

Answer 1

I would like to tell you that this identity works all the time even with big numbers so there is no chance that (A+B)2≠A2+2AB+B2..

here is the proof, :))

A=[1−123] and B=[2110]

(A+B)2≠A2+2AB+B2

(-122+2110)² = (-122)² + 2 × -122 × 2110 + (2110)²

(1988)² = 14884 - 514840 + 4452100

3952144 = 3952144

HOPE THIS HELPS ^_^

please mark as brainliest