can anyone solve 3x squared - 4x - 5= 0?

Answer 1

your question is:

3X² - 4X - 5 = 0

Using Quadratic formula, u can easiy solve it
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If we have a form aX² + bX + C = 0

then X = [-b ± √(b²-4ac)]/2a
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for your equation, a =3 , b=-4 and c=-5

by putting these values in quadratic foruma we get.

X = [-b ± √(b²-4ac)] / 2 a

X = [-(-4) ± √(-4² -4(3)(-5))] / 2(3)

X = [+4 ± √( 16+60)] / 6

X= [+4 ± √76]/6

so X=(4+√76/6 and X = (4-√76)/6 >=====Answers

Or

X= (2.1196) and X =(-0.78629) <=====Answers

Answer 2

Divide each term via 3. x²-4/3x-5/3=0 x²-4/3x=5/3 x²-4/3x+sixteen/36=5/3+sixteen/36 (x-4/6)²=60/36+sixteen/36 (x-4/6)²=seventy six/36 ?((x-4/6)²) = ?(seventy six/36) x-4/6=?seventy six/6 x-4/6=2?19/6 x=(4±2?19)/6 x=(2±?19)/3

Answer 3

I don't think it can be solved... Because that's a trinomial.. and in order to facor it you need something that multiplies to be 15 (because of the 5 on the end and the 3 in front of the x2) and has a difference of 4... I can't think of any real numbers that can do that... I'm sorry I'm not much help.

Answer 4

Use the quadratic formula. Type quadratic into a search field and you will be taken to specific help. Then plug in the above equation to find your answer.

Answer 5

using the quadratic formula it is (4+the square root of 76)/6 or
(4-the square root of 76)/6

x=2.12 or -0.79

Answer 6

Sure. Like Falcon said, use the quadratic formula. You should get:

x=(sqrt(19)+2)/3 or x = -(sqrt(19)-2)/3


edit:jomer, your factorization isn't even close. expand it. this doesn't factor cleanly.

Answer 7

Sorry I didn't factor correctly and yeah a_liberal is right !