MBA Exam

if the roots of the equation 2x^4-8x^3+12x^2-8x+2=0 are x1,x2,x3,x4 then the value of (x1+2x2+3x3+4x4) is equal to

1) 1
2) 10
3) 30
4) none of these

Read Solution (Total 1)

2x^4-8x^3+12x^2-8x+2=0
x^4-4x^3+6x^2-4x+1=0
x^3(x-1)-3x^2(x-1)+3x(x-1)-(x-1)=0
(x-1)(x^3-3x^2+3x-1)=0
(x-1)^4=0
the roots are 1,1,1,1
so answer is =1+2+3+4=10
answer is (2)10
12 years agoHelpfull: Yes(0) No(0)

MBA Other Question

What is the number of integers greater than 7000 that can be formed with digits 3, 5, 7, 8 and 9 such that no digits are being repeated?

1) 72
2) 144
3) 120
4) 192
5) 216
The profit and loss statement for the financial year of a company shows a sale of Rs 15200. The primary cost is 25% of sales and leading costs account for 20% of the gross profit. The gross profit is determined by deducting the primary cost plus the cost of miscellaneous expenses of Rs 1200. The managing director's salary of Rs 500 per annum plus 2% of annual sales is a minimum cost. What is the per cent profit on a capital investment of Rs 20000?
i dont knw the ans yet ...but i will surely share when i get it !!

1) 28%
2) 30%
3) 38%
4) 40%