⎡ -2 5 ⎤ ⎡ ❏ ❏ ⎤ ⎡ 0 0 ⎤ ⎥ ⎥ ⎥ ⎥ = ⎥ ⎥ ⎣ 4 -10 ⎦ ⎣ ❏ ❏ ⎦ ⎣ 0 0 ⎦ (Fill in the 4 blanks)
If B = (a b) (c d) than AB=0 if 2a=5c. So let B = (5 5) (2 2)
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