Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

If -5 is a 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.
Asked by srijan1805 | 06 Mar, 2019, 12:46: PM
answered-by-expert Expert Answer
 
 
begin mathsize 16px style 2 straight x squared space plus space px space minus space 15 space equals space 0 minus 5 space is space straight a space root space of space the space given space Quadratic space Equation. Put space straight x space equals space minus 5 space in space 2 straight x squared space plus space px space minus space 15 space equals space 0 rightwards double arrow 2 open parentheses negative 5 close parentheses squared space plus space straight p left parenthesis negative 5 right parenthesis space minus space 15 space equals space 0 rightwards double arrow 50 space minus space 5 straight p space minus space 15 space equals space 0 rightwards double arrow 35 space equals space 5 straight p rightwards double arrow straight p space equals space 7 We space have space straight p left parenthesis straight x squared space plus space straight x space right parenthesis space straight k space equals space 0 space rightwards double arrow 7 left parenthesis straight x squared space plus space straight x space right parenthesis space straight k space equals space 0 space space space space space since space straight p space equals space 7 rightwards double arrow straight x squared straight k space plus space xk space space plus space 0 equals space 0 straight p left parenthesis straight x squared space plus space straight x space right parenthesis space straight k space equals space 0 space has space equal space roots space mean space straight b squared minus space 4 ac space equals space 0 rightwards double arrow straight k squared space minus space 4 left parenthesis straight k right parenthesis space cross times space 0 space equals space 0 rightwards double arrow straight k squared space equals space 0 rightwards double arrow straight k space equals space 0 end style
Answered by Yasmeen Khan | 06 Mar, 2019, 02:47: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Maths
if one of the zeroes of quadratic polynomial F(x) = 4x² - 8kx - 9 is equal in magnitude but opposite in sign, find K
Asked by rrajansinghakb199 | 08 Apr, 2024, 05:12: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
2 x square - 2 root 2 X + 1 is equal to 0
question image
Asked by goyelgurav | 18 Dec, 2023, 11:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
(x+1)²=2(x-3)
Asked by Kunalbaniya384 | 25 Nov, 2023, 08:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
if alpha and beta are the zeros of the polynomial ax2+bx+c find the value of alpha3+beta3
Asked by mehraharshit.dk000 | 05 Oct, 2023, 08:05: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
what is discriminant
Asked by atharvsharma971 | 06 Jun, 2022, 10:30: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
1,2&3
question image
Asked by zk4656260 | 31 May, 2022, 05:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
FOR WHAT VALUE OF n THE EQUATION 2x2-nx+n=0 has coincident roots
Asked by ankur.spsharma | 02 May, 2022, 11:54: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
3x2+32x+24=0
Asked by nehakoushik101 | 01 May, 2022, 09:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
(a^2+b^2)x^2-2(ac+bd)x+(c^2+d^2)=0
Asked by iambkhatun343 | 14 Feb, 2022, 12:57: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
yqshvi
question image
Asked by semilmasani6005 | 28 Dec, 2020, 01:45: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×