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3 years ago

What is the value of the discrimamt for the quadratic equation 0=x + 2 +x2

Mathematics

1 answer:

Leno4ka [110]3 years ago

3 0

-7 is the value of discriminant for this equation.

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Someone help please

CaHeK987 [17]

Answer:

It would be D

Step-by-step explanation:

7 0

2 years ago

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WARRIOR [948]

Answer:

$2\,(x-1)^2=4$

which is the first option in the list of possible answers.

Step-by-step explanation:

Recall that the minimum of a parabola generated by a quadratic expression is at the vertex of the parabola, and the formula for the vertex of a quadratic of the general form:

$y=ax^2+bx+c$

is at $x_{vertex}=\frac{-b}{2\,a}$

For our case, where $a=2\,\,, b=-4\,\,,\,\,and \,\,c=-2$ we have:

$x_{vertex}=\frac{-b}{2\,a}\\x_{vertex}=\frac{4}{2\,*\,2}\\x_{vertex}=1$

And when x = 1, the value of "y" is:

$y(x)=2x^2-4x-2\\y(1)=2(1)^2-4(1)-2\\y(1)=2-6\\y(1)=-4\\y_{vertex}=-4$

Recall now that we can write the quadratic in what is called: "vertex form" using the coordinates $(x_{vertex},y_{vertex)$ of the vertex as follows:

$y-y_{vertex}=a\,(x-x_{vertex})^2$

Then, for our case:

$y-(-4)=2\,(x-1)^2\\y=2\,(x-1)^2-4$

Then, for the quadratic equal to zero as requested in the problem, we have:

$y=2\,(x-1)^2-4=0\\2\,(x-1)^2-4=0\\2\,(x-1)^2=4$

5 0

3 years ago

Please help me I just don't understand!!!!!!!!!!!!!

Marina86 [1]

Answer:

240pi

Step-by-step explanation:

4 0

2 years ago

Simplify by using the distributive property:

lesya692 [45]

12. 4(s+5)
4s+20

15. 2(3r-12)
6r-24

18. -3(16-3d)
9d-48

3 0

3 years ago

What is (3-4i)^2? In complex numbers?

ANTONII [103]

$(3-4i)^2=9-24i-16=-7-24i$

5 0

3 years ago