2. Double it.
3. Add 9.
4. Subtract 3.
5. Divide by 2.
6. Subtract your original number from the new number.
(The answer will remain the same regardless of the number chosen in the beginning).
Labels: Jenny, math trick, scibe
Welcome to a world where creativity, ingenuity, and mathematics mesh together to create Grade 10 Precalculus math.
Tuesday, May 22, 2007
posted by Anonymous at 4:28 p.m.
1. Choose a number.
2. Double it.
3. Add 9.
4. Subtract 3.
5. Divide by 2.
6. Subtract your original number from the new number.
(The answer will remain the same regardless of the number chosen in the beginning).
2. Double it.
3. Add 9.
4. Subtract 3.
5. Divide by 2.
6. Subtract your original number from the new number.
(The answer will remain the same regardless of the number chosen in the beginning).
Tuesday, May 15, 2007
posted by Anonymous at 9:00 p.m.
GENERAL FORM:
a2 = b2 + c2 - 2bc CosA
** Use this formula when you do not have a complete set of ratios ( a length of a side with its corresponding angle ).
Only use this formula (it's confusing & long) ONCE, and then use the sine law or any other formula to help you complete the trig question you have.
Use the cosine formula given above to substitue in the values:
a2 = b2 ="b + c2 - 2bc CosA
a2 = (7.8)2 + (9.0)2 - 2(7.8)(9.0)Cos112
a2 = 60.84 + 81 - (-52.5947)
a2 = 194.44
a2 = √194.44
a = 13.9
These sites are helpful for extra practice at using cosine law (step-by-step lessons & answers):
http://www.analyzemath.com/Geometry/cosine_law_problems.html
http://www.themathpage.com/aTrig/law-of-cosines.htm
http://dougsimmsonline.googlepages.com/cosinelaw <-- has a vid too!
Labels: cosine law, Jenny, sribe
Sunday, April 01, 2007
posted by Anonymous at 1:44 p.m.
Our new unit...
Labels: Exponents and Radicals, Jenny, scribe
Monday, March 05, 2007
posted by Anonymous at 11:54 p.m.
Factor: 2x^2 + 7x - 4
First, times the terms a and c. Second, find factors of ac that add up to b.
In general, remember that "ax^2 + bx + c" means you have to find the factors of ac that add up to b
First, times the terms a and c. Second, find factors of ac that add up to b.
Add the two factors into the equation, then fully factor the equation. You can use the FOIL method to check if your answer brings you back to the original equation.
Don't get it? Don't worry =)
check out this helpful link:
http://www.rock.uwc.edu/facultypages/galexand/baw/thirteen/lesson13.htm
check out this helpful link:
http://www.rock.uwc.edu/facultypages/galexand/baw/thirteen/lesson13.htm
Labels: grouping method, Jenny, scribe
