4 years ago

Lucia finds that (3x^2+3x+5)

Mathematics

2 answers:

wlad13 [49]4 years ago

7 0

The answer would be x=1

Aneli [31]4 years ago

5 0

Answer:

x=1

Step-by-step explanation:

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Step-by-step explanation:

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netineya [11]

Answer: 12-3= 9

9(5-3)

Distributive property

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4 years ago

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IRISSAK [1]

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3 years ago

1+cos2A /1-cos2A=cotA.cotA

Allisa [31]

Answer:

See Explanation

Step-by-step explanation:

$formulae \: to \: be \: used : \\ \cos 2 \theta = 2 { \cos}^{2} \theta - 1 \\ and \\ \cos 2 \theta = 1 - 2 { \cos}^{2} \theta \\ \\ now \: let \: us \: prove \: the \: given \: trigonometrical \: \\ identity. \\ \\ \frac{1 + \cos2A}{1 - \cos2A} = \cot \: A. \cot \: A \\ LHS = \frac{1 + \cos2A}{1 - \cos2A} \\ \\ = \frac{1 +2 { \cos}^{2} A- 1 }{1 - (1 - 2 { \sin}^{2} A)} \\ \\ = \frac{1 +2 { \cos}^{2} A- 1 }{1 - 1 + 2 { \sin}^{2} A} \\ \\ = \frac{2 { \cos}^{2} A }{2 { \sin}^{2} A} \\ \\ = \frac{{ \cos}^{2} A }{ { \sin}^{2} A} \\ \\ = { \cot}^{2} A \\ \\ = { \cot} A .{ \cot} A \\ \\ = RHS \\ \\ hence \: proved.$

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3 years ago

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Levart [38]

Answer:

Step-by-step explanation:

13 x 17=221

19 x 23=437

437+221=658

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2 is prime and the least

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3 years ago