If - 5 is root of the quadratic equation 2x^2+Px-15 = 0
and the quadratic equation p(x^2+x)+k=0 has equal
roots, find the value of
k .

9514 1404 393

  k = 7/4

Step-by-step explanation:

In quadratic ax^2+bx+c, the product of the roots is c/a, and their sum is -b/a. We know that one root of 2x^2+px-15 is -5, so the other one is ...

  (-15/2)/(-5) = 3/2

Then the value of b (p) is ...

  -p/2 = (3/2)+(-5) = -7/2

  p = 7

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Moving to the next part of the question, the roots will have equal values if the equation is a multiple of a perfect square. The constant in the squared binomial is half the x-coefficient.

  7(x^2 +x) +k = 7(x +1/2)^2 = 7x^2+7x +7/4

Comparing terms, we see that k = 7/4.

why do wages differ across industries

step-by-step explanation :

micro economists are concerned with economics on an industry or individual firm basis.

macro economists are concerned with national and international level