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If px squar +3x+q=0 has two …

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If px squar +3x+q=0 has two roots x=-1,x=-2,find p-q

Posted by Eti Mishra 6 years, 11 months ago

CBSE > Class 10 > Mathematics

2 answers

Prashant Chaudhary 6 years, 11 months ago

Nice

3Thank You

Yogita Ingle 6 years, 11 months ago

px2 + 3x + q = 0
x = 1
p + 3 + q = 0
p + q = -3 .......... (i)
x = -2
p(-2)2 + 3(-2) + q = 0
4p - 6 + q = 0
4p + q = 6 ........... (ii)
Subtract (i) and (ii)
3p = 9
p = 9/3 = 3
Put it in (i)
3 + q = -3
q = -3 -3
q = -6

4Thank You

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Don't post personal information, mobile numbers and other details.
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Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

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CBSE > Class 10 > Mathematics