Question

Use the quadratic formula to solve the equation 3x^2+ 7x - 11 =0 You must show all your working and give your answers correct to 2 decimal places.

Answer 1

Explanation:

Hello, please consider the following.

`3x^2+ 7x - 11 =0\\\\\Delta=b^2-4ac=7^2-4*3*(-11)=49+132=181\\\\x_1=(-b-√(\Delta))/(2a)=(-7-√(181))/(6)=-3.40894...\\\\x_2=(-b+√(\Delta))/(2a)=(-7+√(181))/(6)=1.075604...`

So, it gives -3.41 and 1.08

Thank you.