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CBSE Class 11-science Answered

a , b , c ∈ R , a ≠ 0 and the quadratic equation ax² + bx + c has no real roots,then (a) a + b + c > 0 , (b) a(a + b + c) > 0 , (c) b( a + b + c ) > 0 , (d) c(a + b + c) > 0
Asked by yeeshuraj3 | 10 Sep, 2016, 05:15: PM
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begin mathsize 16px style space a x ² space plus space b x space plus space c space h a s space n o space r e a l space r o o t s space D less than 0 comma a H left parenthesis x right parenthesis greater than 0 space comma space for all space x space element of straight real numbers space comma space W h e r e space H left parenthesis x right parenthesis space equals space a x ² space plus space b x space plus space c space I n space G e n e r a l comma a H left parenthesis 1 right parenthesis space greater than space 0 space S o comma space a left parenthesis a space plus b space plus space c space right parenthesis greater than 0 a H left parenthesis 0 right parenthesis space greater than space 0 space s o comma space a c greater than 0 f r o m space a b o v e space w e space c a n space s a y c left parenthesis a plus b plus c right parenthesis greater than 0 W h i c h space i s space o p t i o n space d. end style
Answered by Tripti Agrawal | 12 Sep, 2016, 05:03: PM

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CBSE 11-science - Maths
For a real number r, the quadratics x² + (r - 1) x + 6 and x² + (2r + 1) x + 22 have a common real root. The sum of the possible values of r can be expressed as a/ b where a, b are relatively prime positive integers. Compute 10a + b
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CBSE 11-science - Maths
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CBSE 11-science - Maths
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CBSE 11-science - Maths
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CBSE 11-science - Maths
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