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2 years ago

The sum of twice a number and 4 is 12.

Mathematics

2 answers:

navik [9.2K]2 years ago

8 0

The answer is three because 4×3 = 12

Evgesh-ka [11]2 years ago

4 0

Answer:

Unknown number = 4

Step-by-step explanation:

Let x = the unknown number

2x + 4 = 12

Subtract 4 from both sides

2x = 8

Divide by 2 on both sides

x = 4

I hope this helped and please mark me as brainliest!

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Neko [114]

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2 years ago

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Tju [1.3M]

Answer:

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Step-by-step explanation:

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2 years ago

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nasty-shy [4]

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3 years ago

I need to get the left side to equal the right side. Keeping the right side alone and not changing it.

likoan [24]

<u>To prove the trigonometric equation:</u>

$\sin ^{3} x+\cos ^{3} x=(\sin x+\cos x)(1-\sin x \cos x)$

$RHS=(\sin x+\cos x)(1-\sin x \cos x)$

We know that $\sin^2x +\cos^2x=1$ , substitute this in place of 1.

$=(\sin x+\cos x)(\sin^2x +\cos^2x-\sin x \cos x)$

Multiply each term of the first term with each term of the 2nd term.

$=\sin^3x + \sin x \cos^2x-\sin^2 x \cos x+\cos x \sin^2 x + \cos^3 x-\sin x\cos^2 x$

Group like terms together.

$=\sin^3x +( \sin x \cos^2x-\sin x\cos^2 x)+(\cos x \sin^2 x-\sin^2 x \cos x) + \cos^3 x$

$=\sin^3x +( 0)+(0) + \cos^3 x$

$=\sin^3x + \cos^3 x$

= LHS

RHS = LHS

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Hence proved.

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3 years ago

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Zinaida [17]

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3 years ago