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Author Topic: If Someone could answer this??  (Read 315 times)

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Offline Jake

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If Someone could answer this??
« on: March 20, 2019, 09:58:19 AM »
1. The roots of the quadratic equation x2 + 2(k +1)x + (2k + 5) = 0 are a andb .
(a) Find the range of values of k for which a andb are real.
(b) Find, in terms of k, the quadratic equation whose roots are (2a +ab ) and
(2b +ab ) .

Please leave your answer below

Thnx
Jake :-)
 

Offline HB

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Re: If Someone could answer this??
« Reply #1 on: March 20, 2019, 06:15:13 PM »
Jake .. the answer is 42 (you need to be a certain age to understand this - ask your Dad )  8)
 

Offline Jake

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Re: If Someone could answer this??
« Reply #2 on: March 21, 2019, 09:51:57 AM »
Jake .. the answer is 42 (you need to be a certain age to understand this - ask your Dad )  8)

I don't have to ask my dad HB cos I'm a massive fan of Hitch Hikers guide to the Galaxy and I'v read the book ;-)
 

Offline mito

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Re: If Someone could answer this??
« Reply #3 on: April 27, 2019, 01:17:33 PM »
 x2 + 2(k +1)x + (2k + 5) = 0

roots of a quadratic equation, which is defined like this ax2+bx+c = 0 are x1 and x2. By the formula for the roots
x1 = [-b + sqrt(b^2-4ac)]/2a, x2 = [-b - sqrt(b^2-4ac)]/2a. The equation has real roots, if D = b^2-4ac is  >= 0.
So all you have to do is replace the coeficients of the equation to the formula and solve the inequality...
« Last Edit: April 27, 2019, 06:21:03 PM by mito »
 

Offline Yusif

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Re: If Someone could answer this??
« Reply #4 on: April 27, 2019, 02:41:38 PM »
value of k = -1/2
 

 

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