SOLUTION: Solve using the quadratic formula and round your answers to the nearest tenth: 3x^2+4x-2=0 I am so confused and don't even know where to start! Help!

Question 380798: Solve using the quadratic formula and round your answers to the nearest tenth: 3x^2+4x-2=0
I am so confused and don't even know where to start! Help!
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Solve using the quadratic formula and round your answers to the nearest tenth: 3x^2 + 4x - 2 = 0
:
Here it is step-by-step
the quadratic formula:

:
The equation is in the form: ax^2 + bx + c = 0;therefore:
a=3; b=4; c=-2
:
Replace these letters in the formula and you have:

Now just do the math

Remember minus a minus is a plus

Find the square root of 40, there will be two solutions

x =
x = .3867 ~ .4
and

x =
x = -1.72 ~ 1.7
:
Two solutions: x = .4, x= -1.7
:
:
It's easy to make a math mistake, so it is a good idea to check your
solutions in the original equation. Replace x with .4
3(.4^2) + 4(.4) - 2 = 0
3(.16) + 1.6 - 2 = 0
.48 + 1.6 - 2 = 0
.08 ~ 0, not exact because we rounded off but close enough to check our answer
;
Check it with x=-1.7
3(-1.7^2) + 4(-1.7 - 2 = 0
3(2.89) - 6.8 - 2 = 0
8.67 - 6.8 - 2 = 0
.13 ~ 0, also close
:
:
Learn this completely, print it out and study it, it will make life much
easier in algebra class. Like giving yourself a lasting Christmas present!
Best regards, Carl

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