Solve or determine the roots of the following quadratic equations by using the Quadratic Formula. Round answers to two decimal places.
a) x^2-7x+5=0
b) 3x^2+4x-2=0

Question

Solve or determine the roots of the following quadratic equations by using the Quadratic Formula. Round answers to two decimal places.
a) x^2-7x+5=0
b) 3x^2+4x-2=0

precal · Answer

if the graph of the function crosses in 2 places, it has 2 solutions|dw:1340591543313:dw|

precal · Answer

|dw:1340591576158:dw|if the graph of the function crosses in 1 place, then it has one solution known as a double root

precal · Answer

If the graph of the function does not cross the x axis, then it has 2 complex solution|dw:1340591613513:dw|

precal · Answer

If you know how to factor, then you will see how many solutions you have.
This will only help if you can factor the quadratics.
Factoring can fail and that is why we use the quadratic formula
the Quadratic formula works 100% of the time

anonymous · Answer

How do you know if it crosses?

precal · Answer

do you have a graphing calculator?

anonymous · Answer

No :P

precal · Answer

https://www.desmos.com/calculator here is one for you

anonymous · Answer

Alright so I get that, but I want to know the answers for the roots

anonymous · Answer

Do I use the discriminate.. D=b^2-4ac or the quadratic formula