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1 year ago

Subtract 7a2-4ab+2b2from 3ab+7a2+2b2

Mathematics

1 answer:

LUCKY_DIMON [66]1 year ago

4 0

Answer:

Step-by-step explanation:

3ab + 7a² + 2b² - (7a² - 4ab + 2b²) = 3ab + 7a² + 2b² - 7a² + 4ab - 2b²

Now combine like term. Like terms have same variable with same power.

= 3ab + 4ab + 7a² - 7a² + 2b² - 2b²

= 7ab

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jeyben [28]

Answer:

$Probability = \frac{11}{40}$

Step-by-step explanation:

Given

See attachment

Required

The probability that a 7th grader selected will play guitar.

From the attachment, we have:

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2 years ago

Reduce 8/4 what is the lowest number

nika2105 [10]

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2 years ago

Read 2 more answers

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Monica [59]

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2 years ago

Read 2 more answers

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miskamm [114]

Answer:

x = 180

Step-by-step explanation:

First, you need to know

1. Double-angle formula:

cos(2x) = $cos^{2}x - sin^{2}x$

2. Pythagorean identity:

$cos^{2}x + sin^{2}x = 1$

Back to your problem, replacing the variable by the above:

$5cosx-sin\frac{x}{2}+7 = 0$

$5(cos^{2}\frac{x}{2}-sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Double-angle formula

$5(1 - 2sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Pythagorean identity

Given $y = \frac{x}{2}$

$5(1-2sin^{2}y) - 2siny + 7 = 0$

$10sin^{2}y+2siny-12=0$

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2 years ago

2 of 2 X= 1 True False

stepan [7]

Answer:

of means to multiple so it would equal 4 so the answer is false

4 0

2 years ago