Consider the vectors and find the number using dot product.
a = {-2,-2}
b = {-3, 3}
c = {5, -1}
(a-b) . (b +c) = i got -10 but my online homework system says its wrong i reworked it numerous times and got the same answer so i'm wondering if its a system error or if i got it wrong thanks
a = {-2,-2}
b = {-3, 3}
c = {5, -1}
(a-b) . (b +c) = i got -10 but my online homework system says its wrong i reworked it numerous times and got the same answer so i'm wondering if its a system error or if i got it wrong thanks
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a-b = {-2-(-3),-2-3} = {-2+3,-2-3} = {1,-5}
b+c = {-3+5,3+(-1)} = {-3+5,3-1} = {2,2}
So the dot product = (1 x 2)+(-5 x 2) = 2+(-10) = -8
b+c = {-3+5,3+(-1)} = {-3+5,3-1} = {2,2}
So the dot product = (1 x 2)+(-5 x 2) = 2+(-10) = -8