Solution: The missing reason in Step 8 is substitution of
.
Explanation:
The given steps are used to prove the formula for law of cosines.
From step 5 it is noticed that our equation is
..... (1)
From step 7 it is noticed that the value of
is
.
So by substituting
for
in equation (1) we get the equation of step 8, i.e.,

Hence, the missing reason in Step 8 is substitution of
.
Step-by-step explanation:
- On the Y-axis where the 2 is you go 3 to the right and put your point right there above the 3.
- There you have your answer on the graph.
Answer:
x = 37
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