FOIL Day 3. We will continue with presentations from yesterday. Then begin multiplying a polynomial by a binomial. Homework #106 answers. 2. x 2 + 4x + 4 4. t 2 + t – 12 6. z 2 – 4z – 5
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We will continue with presentations from yesterday.
Then begin multiplying a polynomial by a binomial.
2. x2 + 4x + 4 4. t2 + t – 12 6. z2 – 4z – 5
8. 2x2 – 18 10. 2l2 – 3l -20 12. 5q2 + 24q – 5
14. 6m2 – 6 16. 10a2 – 19a + 6 18. 2x2 – 3xy + y2
Remember the same rules apply. Be courteous to those who still have to present.
Example: (3x + 2)(2x2 – 4x + 5)
One way is to use distribution.
Take the first term of the binomial and multiply it to the trinomial.
3x(2x2 – 4x + 5)
6x3 -12x2 + 15x
Then multiply the second term of the binomial and multiply it to the trinomial.
2(2x2 – 4x + 5)
4x2 – 8x + 10
Then combine the like terms from the two products
6x3 -12x2 + 15x + 4x2 – 8x + 10
6x3 -8x2 + 7x + 10
2x2– 4x + 5 multiply
3x + 2
4x2 – 8x + 10
6x3 -12x2 + 15x then add
6x3 – 8x2 + 7x + 10
Same answer, but in my opinion if you line up the like terms and add straight down, it is easier.
First I multiplied everything on the top by “2”
Then I multiplied everything on the top by “3x”
I lined up the like terms and added straight down.
Please complete #1-10 on page 21 as class work.
Check your answers with Ms. Cruz.
There is no homework.
Have a great weekend and a nice Memorial Day! I will see you Tuesday, pain or no pain!