Given that $a = \langle 4 , - 1 \rangle , b = \langle 2,3 \rangle , \text { and } c = \langle - 5,3 \rangle$ , find the number. $( a - b ) \cdot ( b + c )$
A) -30
B) -60
C) 38
D) -42
E) 18

Question

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The Answer of Given that $a = \langle 4 , - 1 \rangle , b = \langle 2,3 \rangle , \text { and } c = \langle - 5,3 \rangle$ , find the number. $( a - b ) \cdot ( b + c )$
A) -30
B) -60
C) 38
D) -42
E) 18

Given That a=⟨4,−1⟩,b=⟨2,3⟩, and c=⟨−5,3⟩a = \langle 4 , - 1 \rangle , b = \langle 2,3 \rangle , \text { and } c = \langle - 5,3 \ranglea=⟨4,−1⟩,b=⟨2,3⟩, and c=⟨−5,3⟩

Given That $a = \langle 4 , - 1 \rangle , b = \langle 2,3 \rangle , \text { and } c = \langle - 5,3 \rangle$