Find a· b.
-$a = 10 i + 7 j , \quad b = - 4 i + 3 j$
A) $\langle - 40,21 \rangle$
B) 61
C) $- 19$
D) $\langle 6,10 \rangle$

Name: Find a· b. -$a = 10 i + 7 j , \quad b = - 4 i + 3 j$ A) $\langle - 40,21 \rangle$ B) 61 C) $- 19$ D) $\langle 6,10 \rangle$
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Question

Quizplus · Accepted Answer

The dot product of two vectors $a = 10i + 7j$ and $b = -4i + 3j$ is calculated as $a \cdot b = (10)(-4) + (7)(3) = -40 + 21 = -19$.

Find A· B - a=10i+7j,b=−4i+3ja = 10 i + 7 j , \quad b = - 4 i + 3 ja=10i+7j,b=−4i+3j

Find A· B
- $a = 10 i + 7 j , \quad b = - 4 i + 3 j$