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Amanda [17]
2 years ago
8

Factorise 15x+ 18y???

Mathematics
2 answers:
anyanavicka [17]2 years ago
4 0
Oh dear~This can only be simplified。
15X+18y
3(5X+6Y)
That's your answer.
aev [14]2 years ago
4 0
3(5X+6Y) THIS IA THE EXACT ANSWER TO FACTORISE THIS EQUATION. JUST FACTOR OUT THE COMMON FACTOR FROM THE EQUATION.
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Plz help me with this...there might be errors in this but I'm not sure ​
Flura [38]

Step-by-step explanation:

1.  cot(A − B)

From angle sum/difference equations, we know this equals:

cot(A − B) = (cot A cot B + 1) / (cot B − cot A)

But we also know it equals:

cot(A − B) = 1 / tan(A − B)

cot(A − B) = (1 + tan A tan B) / (tan A − tan B)

Setting the two equal to each other:

(cot A cot B + 1) / (cot B − cot A) = (1 + tan A tan B) / (tan A − tan B)

Writing tangent in terms of cotangent:

(cot A cot B + 1) / (cot B − cot A) = (1 + 1 / (cot A cot B)) / (tan A − tan B)

(cot A cot B + 1) / (cot B − cot A) = ((cot A cot B + 1) / (cot A cot B)) / (tan A − tan B)

(cot A cot B + 1) / (cot B − cot A) = (cot A cot B + 1) / ((cot A cot B) (tan A − tan B))

Divide both sides by the numerator:

1 / (cot B − cot A) = 1 / ((cot A cot B) (tan A − tan B))

Take inverse of both sides:

cot B − cot A = (cot A cot B) (tan A − tan B)

Solve for cot A cot B:

cot A cot B = (cot B − cot A) / (tan A − tan B)

cot A cot B = a / b

Now substitute into the first angle difference equation we wrote earlier:

cot(A − B) = (cot A cot B + 1) / (cot B − cot A)

cot(A − B) = (a / b + 1) / a

cot(A − B) = (a / b) / a + 1 / a

cot(A − B) = 1 / b + 1 / a

2. cos A / (1 ± sin A)

From angle sum/difference formulas, we know:

sin (90 ± A) = cos A

cos (90 ± A) = ∓ sin A

Substituting:

sin (90 ± A) / (1 − cos (90 ± A))

From half angle formula, this equals:

cot (45 ± A/2)

Using reflection:

-cot (-45 ∓ A/2)

And finally, phase shift:

tan (-45 ∓ A/2 + 90)

tan (45 ∓ A/2)

Check that you wrote the problem correctly.  Looks like you switched ∓ with ±.

8 0
3 years ago
Hello, im not sure where my teacher got 180 out of this scatter plot
kakasveta [241]
24+56=80 on the first column of the chart
5 0
3 years ago
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A recipe that serves four people calls for 2 1/4 cups of butter. How many cups of butter needed to serve 10 people? Show your wo
Eduardwww [97]

Answer:

5 5/8

Step-by-step explanation:

2 1/4 * 2 = 4 1/2

2 1/4 / 2 = 1 1/8

4 4/8 + 1 1/8 = 5 5/8

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Solve for the variable using cross products. <br> 3/5 = x/6 <br> Solve for x as a decimal
Lynna [10]

Answer:

x = 3.6

Step-by-step explanation:

3/5 = x/6

multiply both sides by 6

18/5 = x

as a decimal

x = 3.6

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to find the radius you divide the circumference by 2pi

area is pi times radius to the 2nd power

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