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IgorLugansk [536]

2 years ago

12

5r^2-13r-6=0 How do I solve this

2 answers:

frosja888 [35]2 years ago

7 0

$5 {r}^{2} - 13r - 6 = 0 \\ a = 5 \\ b = - 13 \\ c = - 16 \\$

<em>r</em><em>=</em><em> </em><em><u>-</u></em><em><u>(</u></em><em><u>-</u></em><em><u>1</u></em><em><u>3</u></em><em><u>)</u></em><em><u>±</u></em><em><u>></u></em>

<em><u> $\sqrt{( - 13) {}^{2} } - 4.5( - 6)$ </u></em>

<u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u>

<em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em>2</em><em>.</em><em>5</em>

<em>r</em><em>=</em><em> </em><em><u>1</u></em><em><u>3</u></em><em><u>±</u></em><em><u>1</u></em><em><u>7</u></em>

<em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em>1</em><em>0</em>

<em>r</em><em>=</em><em><u>1</u></em><em><u>3</u></em><em><u>+</u></em><em><u>1</u></em><em><u>7</u></em>

<em> </em><em> </em><em> </em><em> </em><em> </em><em>1</em><em>0</em>

<em>r</em><em>=</em><em><u>1</u></em><em><u>3</u></em><em><u>-</u></em><em><u>1</u></em><em><u>7</u></em>

<em> </em><em> </em><em> </em><em> </em><em> </em><em>1</em><em>0</em>

<em> $r = 2 \\ r = \frac{ - 2}{5}$ </em>

<em> $this \: the \: answer \: your \: question \\ \\ mark \: me \: as \: a \: brainlist \: plz$ </em>

nignag [31]2 years ago

7 0

Answer: you need to factor then you can solve

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Select the correct answer. what is this series written in sigma notation? 2.5 2.5(1.2) 2.5(1.2)2 ⋯ 2.5(1.2)87 a. ∑ k = 1 87 2.5

Marat540 [252]

<u> ∑ k = 1 88 2.5 ⁢ ( 1.2 ) k</u><u> is this series written in </u><u>sigma notation. </u>

What is the series written in sigma notation?

A series can be represented in a compact form, called summation or sigma notation.
The Greek capital letter, ∑ , is used to represent the sum. The series 4+8+12+16+20+24 can be expressed as 6∑n=14n .
The expression is read as the sum of 4n as n goes from 1 to 6 .

Given:

2.5 + 2.5(1.2) + 2.5(1.2)2 + ⋯ + 2.5(1.2)87

If we look at the power it is always one less the term i.e., for first term the value of k=0.

So, the series in the form of summation can be written as

∑ k = 1 88 2.5 ⁢ ( 1.2 ) k

Learn more about sigma notation

brainly.com/question/16701078

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8 0

1 year ago

Find the exact value of the given expression.<br> sin(2cos^-1(5/13))

xeze [42]

Answer:

+120/169 or -120/169

Step-by-step explanation:

let $cos^{-1}[\frac{5}{13} ] = \alpha$

where, alpha is some angle that satisfies the assumed condition.

so, $cos\alpha= 5/13$

[ taking cos to the other side or applying cos on both sides]

now, substitute this in the given expression

$sin(2cos^-1(5/13)) = sin(2\alpha )$

as sin $\beta$ = $+ or -\sqrt{1-(cos\beta) ^{2}$

[by general trigonometry formula: $cos^{2}[\beta] +sin^{2}[\beta]=1$ ]

so if $cos\alpha= 5/13$ , we can get sin $\alpha$ from the above formula as + or - 12/13

(because, after taking square root on both sides we keep + or -]

as, sin $2\beta = 2*sin[\beta ]*cos[\beta ]$

[by general trigonometry formula]

here, now $sin[2\alpha ]=2*(+or- 12/13)*5/13\\$

so, the final value can be 120/169 or -120/169.

4 0

3 years ago

Find the missing side of the triangle!!!!!!<br> Help me!!!!!!!!

marshall27 [118]

Answer:

The missing side of the triangle is x

Step-by-step explanation:

x is the missing side bc it is the only side that doesnt have a number

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3 years ago

Find the missing value -3 = ? -11

maria [59]

Answer

Positive 8 is the missing value

Step-by-step explanation:

-11 + 8 = -3

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2 years ago

A watermelon seed is 0.4 long. How far would a line of 112 watermelon seeds stretch?

Korvikt [17]

Since one watermelon seed is 0.4 long, you can multiply 0.4 by 112

0.4 x 112 = 44.8

So it will be 44.8 long

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3 years ago