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Find a ⋅ b. a = 4i - 4j, b = 4i + 5j

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trig
pre-calc

asked Aug 25, 2014 in PRECALCULUS by anonymous

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1 Answer

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a =4i - 4j; b =4i + 5j

a ⋅ b is a scaler product

if a =x1i + y1j b= x2i +y2j

a ⋅ b =x1x2 + y1y2

a ⋅ b =(4)(4) + (-4)(5)

=16 - 20

=- 4

answered Aug 25, 2014 by bradely Mentor

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