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makennahudson94
18.09.2019 •
Mathematics
Use synthetic division to find the value of p and q if x+1 and x-2 are the factors of x3+ px2 + qx + 6
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Ответ:
Adding these equations together, you get
Ответ:
2 / 1 p q 6
+22p+4
1 p+2 2p+q+4
Finish this. Note that if 2 is a root and x-2 is a factor, the final result MUST equal 0. Thus, we get the equation p-q=5.
Do the same thing for the root -1 (which comes from the factor (x+1).
You'll end up with two linear equations which can be solved for p and q.
Substitute these values of p and q into the given polynomial. p=-4, so that polynomial becomes x^3 - 4x + q + 6.
I did this, and found that -1 and +2 are indeed roots of the resulting polynomial.
Ответ:
David, 20%
Step-by-step explanation:
Anna saves 19%.
Laura spends 17/20 , or, 85/100=> Laura saves 15/100; 15%.
amount of salary David saves : amount of salary he spends = 2:8,
or, 20/100 : 80/100
=> David saves 20/100; 20%.
David saves the most, (20%).