solve by useing the quadratic formula -12x squared+5x+2=0?
回答 (9)
2009-02-17 3:02 pm
✔ 最佳答案
sqr(delta) = 11x1 = (-5 -11) / -24 = 16/24 = 2/3
x2 = (-5 + 11) / -24 =-6/24 = -1/4
-12 * (x + 1/4) * (x - 2/3) = (4x + 1) * (2 - 3x)
2009-02-17 11:13 pm
The quadratic formula is this:
x = [-b ± â(b² - 4ac)]/2a.
Just plug in the numbers from your equation:
a = -12. b = 5, and c = 2.
x = {-5 ± â[(5)² - 4(-12)(2)]}/ 2 (-12)
x = [-5 ± â(25 + 96)]/-24
x = (-5 ± â121)/-24
x = (-5 ± 11)/-24
x = (-5 + 11)/-24 = 6/-24 = -¼
or
x = (-5 - 11)/-24 = -16/-24 = 2/3
To verify they work, plug each x value into the original equation. I will leave that for you to do.
x = [-b ± â(b² - 4ac)]/2a.
Just plug in the numbers from your equation:
a = -12. b = 5, and c = 2.
x = {-5 ± â[(5)² - 4(-12)(2)]}/ 2 (-12)
x = [-5 ± â(25 + 96)]/-24
x = (-5 ± â121)/-24
x = (-5 ± 11)/-24
x = (-5 + 11)/-24 = 6/-24 = -¼
or
x = (-5 - 11)/-24 = -16/-24 = 2/3
To verify they work, plug each x value into the original equation. I will leave that for you to do.
2009-02-17 11:09 pm
This equation is of form ax^2+bx+c
a = -12 b = 5 c = 2
x=[-b+/-sqrt(b^2-4ac)]/2a]
x=[-5 +/-sqrt(5^2-4(-12)(2)]/(2)(-12)
discriminant is b^2-4ac =121
x=[-5 +â(121)] / (2)(-12)
x=[-5 -â(121)] / (2)(-12)
x=[-5+11] / -24
x=[-5-11] / -24
-6/24=-1/4 solution 1
-16/-24=2/3 solution 2
a = -12 b = 5 c = 2
x=[-b+/-sqrt(b^2-4ac)]/2a]
x=[-5 +/-sqrt(5^2-4(-12)(2)]/(2)(-12)
discriminant is b^2-4ac =121
x=[-5 +â(121)] / (2)(-12)
x=[-5 -â(121)] / (2)(-12)
x=[-5+11] / -24
x=[-5-11] / -24
-6/24=-1/4 solution 1
-16/-24=2/3 solution 2
2009-02-17 11:06 pm
-12x^2 + 5x + 2
= -12x^2 + 8x - 3x + 2
= (-12x^2 + 8x) - (3x - 2)
= -4x(3x - 2) - 1(3x - 2)
= (3x - 2)(-4x - 1)
= -(3x - 2)(4x + 1)
= -12x^2 + 8x - 3x + 2
= (-12x^2 + 8x) - (3x - 2)
= -4x(3x - 2) - 1(3x - 2)
= (3x - 2)(-4x - 1)
= -(3x - 2)(4x + 1)
2009-02-17 11:03 pm
the quadratic formula is
-b plus or minus the square root of b squard minus (four times a times c)
all over two a
a=12 b=5 c=2
just plug in thoes number to the equation
-b plus or minus the square root of b squard minus (four times a times c)
all over two a
a=12 b=5 c=2
just plug in thoes number to the equation
2009-02-17 11:05 pm
(3x-2)(4x+1)
Therefore the answer is x= 2/3 or x=-1/4
Therefore the answer is x= 2/3 or x=-1/4
2009-02-17 11:03 pm
the answer is really simple!!!!!!
just solve using the reciprocal of pi, and then square the negative number, after subtracting it from x!!!1
it is sooo simple!
just solve using the reciprocal of pi, and then square the negative number, after subtracting it from x!!!1
it is sooo simple!
2009-02-17 11:02 pm
I quit mathematics a long time ago ! LOL
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