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2 years ago

2xsquared +3x+1=0 solve using quadratic formula

Mathematics

1 answer:

vlada-n [284]2 years ago

5 0

Answer:

x = $\frac{1}{2}$ , -1

Step-by-step explanation:

The quadratic formula is: -b±√b²-4ac

The discriminant (Δ) is b²-4ac. Evaluating this expression after substituting for a, b and c helps you identify the number of real solutions to the quadratic equation.

a = 2, b = 3, c = 1

Δ = -3²- 4 x 2 x 1;

Δ = 1

-3±1

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I don't get this at all Plz Help Me

Lera25 [3.4K]

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3 years ago

Use the standard normal distribution to find P(-1.23 Sz<2.12).

matrenka [14]

Answer:

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Step-by-step explanation:

Unless you have a table of the normal distribution available, this is a calculator problem. Your calculator, or any spreadsheet, can tell you the probability is ...

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1 year ago

∫(cosx) / (sin²x) dx

kirza4 [7]

If you're using the app, try seeing this answer through your browser: brainly.com/question/2822772

_______________

Evaluate the indefinite integral:

$\mathsf{\displaystyle\int\! \frac{cos\,x}{sin^2\,x}\,dx}\\\\\\
=\mathsf{\displaystyle\int\! \frac{1}{(sin\,x)^2}\cdot cos\,x\,dx\qquad\quad(i)}$

Make the following substitution:

$\mathsf{sin\,x=u\quad\Rightarrow\quad cos\,x\,dx=du}$

and then, the integral (i) becomes

$=\mathsf{\displaystyle\int\! \frac{1}{u^2}\,du}\\\\\\
=\mathsf{\displaystyle\int\! u^{-2}\,du}$

Integrate it by applying the power rule:

$\mathsf{=\dfrac{u^{-2+1}}{-2+1}+C}\\\\\\
\mathsf{=\dfrac{u^{-1}}{-1}+C}\\\\\\
\mathsf{=-\,\dfrac{1}{u}+C}$

Now, substitute back for u = sin x, so the result is given in terms of x:

$\mathsf{=-\,\dfrac{1}{sin\,x}+C}\\\\\\
\mathsf{=-\,csc\,x+C}$

$\therefore~~\boxed{\begin{array}{c}\mathsf{\displaystyle\int\! \frac{cos\,x}{sin^2\,x}\,dx=-\,csc\,x+C} \end{array}}\qquad\quad\checkmark$

I hope this helps. =)

Tags: indefinite integral substitution trigonometric trig function sine cosine cosecant sin cos csc differential integral calculus

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3 years ago

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Sergio [31]

Answer:

i79

Step-by-step explanation:

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3 years ago

Please help I been waiting for hours and I need to find out how to simplify complex fractions.

schepotkina [342]

Answer:

Method 1:

Find the Least Common Denominator (LCD) of all the denominators in the complex fractions.

Multiply this LCD to the numerator and denominator of the complex fraction.

Simplify, if necessary.

Method 2:

Create a single fraction in the numerator and denominator.

Apply the division rule of fractions by multiplying the numerator by the reciprocal or inverse of the denominator.

Simplify, if necessary.

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2 years ago