CBSE Class 10 Answered

(i) If graph of quadratic polynomial ax²+bx+c

what is the sign of “c”.pls answer me fast

tmrw is my test

Asked by my3shyll | 19 Apr, 2016, 04:44: PM

Expert Answer

Q u e s t i o n space i s space i n c o m p l e t e colon Q u e s t i o n space s h o u l d space b e colon I f space t h e space g r a p h space o f space q u a d r a t i c space p o l y n o m i a l space a x squared plus b x plus c space c u t s space t h e space p o s i t i v e space y minus a x i s comma space w h a t space i s space t h e space s i g n space o f space c ? o r space I f space t h e space g r a p h space o f space q u a d r a t i c space p o l y n o m i a l space a x squared plus b x plus c space c u t s space t h e space n e g a t i v e space y minus a x i s comma space w h a t space i s space t h e space s i g n space o f space c ? S o l u t i o n colon C a s e 1 colon S u p p o s e space t h e space g i v e n space q u a d r a t i c space c u t s space t h e space p o s i t i v e space y minus a x i s. O n space y minus a x i s comma space x equals 0 T h u s comma y equals a cross times 0 squared plus b cross times 0 plus c space space space equals c T h u s space y equals c space a n d space h e n c e space t h e space s i g n space o f space c space i s space p o s i t i v e. C a s e 2 colon S u p p o s e space t h e space g i v e n space q u a d r a t i c space c u t s space t h e space n e g a t i v e space y minus a x i s. O n space y minus a x i s comma space x equals 0 T h u s comma minus y equals a cross times 0 squared plus b cross times 0 plus c rightwards double arrow space y space equals negative c T h u s space y equals negative c space a n d space h e n c e space t h e space s i g n space o f space c space i s space n e g a t i v e. E x a m p l e colon O b s e r v e space t h e space f o l l o w i n g space g r a p h colon T h e space b l u e space c o l o u r space c u r v e space c u t s space t h e space p o s i t i v e space y minus a x i s space a n d space h e n c e space c space i s space p o s i t i v e space 3. T h e space r e d space c o l o u r space c u r v e space c u t s space t h e space n e g a t i v e space y minus a x i s space a n d space h e n c e space c space i s space n e g a t i v e space 3.

Answered by Vimala | 20 Apr, 2016, 11:01: AM

CBSE Class 10 Answered

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CBSE Class 10 Answered

Application Videos

Geometric Meaning of The Zeroes

Zeroes of A Polynomial

Identifying A Polynomial or A Quadratic Polynomials

Concept Videos

Geometric Meaning of The Zeroes

Types, degree and zeroes of a polynomial

Geometric Meaning Of Zeroes

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