Saturday

March 28, 2015

March 28, 2015

Posted by **ANR** on Sunday, October 14, 2012 at 10:16pm.

2) if 7 and -1 are two of the solutiosn for x in the equation 2x^3 +kx^2 -44x+w=0, find the value of k+w

3) from an ordinary deck of 52 cards, two cards are selected at random (without replacement). find the probability that both cards were hearts. express your answer as a common fraction reduced to lowest terms.

- Math -
**Reiny**, Sunday, October 14, 2012 at 10:35pm1. if log

_{7}143 = x

then 7^x = 143

but 7^2 = 49 and 7^3 = 343

so k=2 and w = 3

then k+w = 5

2. let f(x) = 2x^3 + kx^2 - 44x + w

if 7 is a solution then f(7) = 0

2(343) + 49k - 308 + w = 0

49k + w = -378

if -1 is a solution, then f(-1) = 0

2(-1) + k + 44 + w = 0

k + w = -42

subtract them:

48k = -336

k = -7

in k+w=-42, -7+w = -42 ---> w = -35

and k+w = -42

3) prob(2 hearts) = (13/52)(12/51) = 1/17

- Math -
**ANR**, Monday, October 15, 2012 at 12:04amthank you!

**Answer this Question**

**Related Questions**

math, algebra - 2a+2ab+2b I need a lot of help in this one. it says find two ...

quad. eq. - find 3 consecutive integers such that the product of the second and ...

Pre-Algebra - Find two consecutive odd integers such that 5 times the first ...

Math - If the product of 4 consecutive integers is equal to one of the integers...

mathematics - Three times the reciprocal of the sum of two consecutive odd ...

math - there are three consecutive positive integers such that the sum of the ...

math - don't understand help please When one half of the second of two ...

math - The product of two consecutive integers is two hundred forty. Find the ...

math - i dont get this question consecutive integers are integers that differ by...

Math - When you solve questions like "The sum of 3 consecutive integers is 147. ...