Question

Please solve this sum using quadratic equation formula ..thank you !

Answer 1

Step-by-step explanation:

Here, y=2x^2+5x

7^y=1/343

=>7^2x^2+5x=(1/7)^3

=>7^2x^2+5x=7^-3

Here, on both the sides 7 gets cancelled..

=>2x^2+5x=-3

=>2x^2+5x+3=0

=>2x^2+3x+2x+3=0

=>x(2x+3)+1(2x+3)=0

=>(x+1)(2x+3)=0