IIT JEE , AIEEE Forum - Mathematics , Algebra

rakesh61

Can any one tell me thwe concept of wavy curve method

I am having doubt of when to take +ve and -ve in the number line

with an easy example

I promise to rate you....

piyachopra

u can see this in studymaterial maths...quadratic equations

example....

Solve the inequality

Solution:

Fig (1)

at point -8/5 no change will takes place as there is square in the term

the curve which r below numberline are -ve n above are positive

elessar_iitkgp

Excellent explanation Priya

ambareesh13

hmm we dont include even powers in the wavy curvy method ...because the graph doesnt change its sign there...even though if it is there

ambareesh13

clarify my doubt ..am i correct?

ayush007

somewhat ,you can take it that way....but,the even powers shouldn't be ignored at all...as you require to know at least the pt. where the sign dosen't change...,

lets take an example...

if in a fn. there's a pt. -1 which has the even power...but in the denominator -1 (if included),gives us an indefinite value...so its clear not to include it in the values of x...

f(x)={(x+1) ⁴(x-3/5)³ / (x+1)}..

you solve it and decide does the even powers can really be ignored.....

i'm sure you will find this useful..

keep smiling..............

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