Question

find the value of a- 2b+c for the equation -3x-2y+8=0
please solve this

Answer 1

Answer:

Given a,b,c>0

a=2b+3c-Equation 2

f(x)=ax  

2

+bx+c=0

For real roots, D≥0

⇒D≡b  

2

−4ac≥0

≡(  

2

a−3c

​  

)  

2

−4ac≥0

⇒a  

2

−6ca+9c  

2

−16ac≥0

⇒a  

2

−22ac+9c  

2

≥0

⇒(  

c

a

​  

)  

2

−22  

c

a

​  

+9≥0

⇒(  

c

a

​  

)  

2

−  

9

22

​  

(  

c

a

​  

)+9+(11)  

2

−(11)  

2

≥0

⇒(  

c

a

​