Answers by visitors named: Klee
x dot y = 2 x 5 x cos60 = 5
Use the distributive property:
(x-2y) dot (x+3y)
= x dot x - 2(x dot y) + 3 (x dot y) - 6(y dot y)
= x dot x + (x dot y) - 6(y dot y)
= |x|^2 + (x dot y) - 6|y|^2
= 4 + 5 - 150
=-141
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