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makeithappen60
24.01.2020 •
Mathematics
If (ax+2)(bx+7) = 15xsquared + cx +14 for all values of x, and a+b =8, what are the two possible values for c?
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Ответ:
The two possible values for c are 31 and 41
Step-by-step explanation:
Given Expression:
a + b = 8
To expand,
Multiply a x with (b x + 7) =![a b x^{2}+7 a x](/tpl/images/0469/1745/00d5c.png)
Multiply 2 with (b x + 7) = 2 b x +14
Now, combining the above, we get
When comparing both sides, we get
a b = 15, 7 a + 2 b = c
Now, substitute above value in a + b = 8. So,
Factorising above, we get the equation as
(b - 3) (b - 5) = 0
b = 3 and 5
If b = 3, then
If b = 5, then
If a = 3, b = 5
c =7 a + 2 b = 7 (3) + 2 (5) = 21 + 10 = 31
If a = 5, b = 3
c =7 (5) +2 (3) = 35 + 6 = 41
Therefore, the values of ‘c’ are 31 and 41 .
Ответ:
Please dont copy and paste these things, took me a long time to decode.
1)A and C are correct.
2)No, the deffinitions have opposite results.
Step-by-step explanation:
1) They want to narrow down to "per writer" and A and C were the only ones that ended with per writer. It's about the writers not the words.
2)Website A had 22 posts per writer and 2200 words per writer.
Website B had 18.1818... posts per writer and 3090.9090... words per writer.
Their results can't be compared because A is bigger in one thing and B is bigger in another. ( A in posts per writer and B had more words per writer. ) , so they are opposite results.
Hope this helped! Remember to not just copy and paste and expect an answer! If this helped, just give me a rating, a thank you, and maybe a comment if help is needed on another question! Have a great day!