Which two equations would be most appropriately solved by using the quadratic formula?Select each correct answer.(x−1)2=40.25x2+0.8x−8=03x2−4x=15(x−6)(x+9)=0

The general form of quadratic equation which is solved by using the quadratic formula is a x² + b x + c = 0  

Where: a, b and c are constants


by comparing the previous formula  with the given options 
The most appropriate equations are

0.25x² +0.8x − 8 =0

3x² − 4x = 15


so, the correct answer is options 2 and 3