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2 years ago

-2x^2+bx -5 Determine the b-value that would ensure the function has two real root.

Mathematics

1 answer:

anastassius [24]2 years ago

8 0

Answer:

No solution

Step-by-step explanation:

Given is the quadratic function

y = -2x² + bx - 5

In order to have two real roots the discriminant should be posivive

D = - b² - 4ac
D = - b² - 4(-2)(-5) = - b² - 40

We need D > 0

-b² - 40 > 0
b² + 40 < 0
b² < - 40

There is no solution as b² is never negative

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Step-by-step explanation:

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3 years ago

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3 years ago

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Solve the system of equations graphicallySolution=?

BigorU [14]

The given system is

$\begin{cases}y=\frac{5}{2}x-8 \\ y=-\frac{1}{2}x-2\end{cases}$

Given that y = y, let's combine the equations

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Let's solve for x

$\begin{gathered} \frac{5}{2}x+\frac{1}{2}x=8-2 \\ \frac{6}{2}x=6 \\ 3x=6 \\ x=\frac{6}{3} \\ x=2 \end{gathered}$

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The solution is (2, -3).

The image below shows the solution graphically.

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1 year ago

Out of the 40 students in the 7th grade class, 60% of the students carry a cell phone. What fraction of the students in the 7th

xz_007 [3.2K]

Answer:

Fraction of the students in the 7th grade class carry a cell phone = 3/5

24 students carry a cell phone

Step-by-step explanation:

40 students in the 7th grade, 60% of the students carry a cell phone.

so 40 x 0.6 = 24 students carry a cell phone

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3 years ago

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Answer:

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Step-by-step explanation:

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