This video uses substitution to solve and then checks by graphing. Pay close attention to the graphing part:
Here are the answers to the midterm review that were not included in the package already.
9) (same as 10) x = (3+-sqrt65)/4
17 sinθ=-3/5, cosθ=-4/5, tanθ=3/4
18) sinθ=-12/13, tanθ=12/5
21) 130° and 310°
22) b=5.4 cm
24a) ambiguous case: h<a<b b) a<h
25) BC = 33.1 m
27) x≥-3 and x≥5 (latter being more restrictive)
28a) y≥3; y=4 & 3 b) n≥-25/7; n=8 c) m≥-3/2; m=11 d) no restrictions (b/c cubed root); x=-21 e) x≥0 (more restrictive) and x≥-4/5; x=0.
Also note the errors in the Midterm Review Sheet:
Answer #3) minimum
Question #4a) y=x2-24x+150
Question #23) b=24, a=42
Please email me if you find any more errors!
When y is present in the equation:
When y is not present (ie, y=0) in the equation:
In the videos, you can move the captions to the side if it’s blocking your view.
I couldn’t find any videos with BEDMAS & Rational Expressions. Just follow the rules of BEDMAS and you should be fine 🙂 Or, refer to my class notes.