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boyakko [2]
3 years ago
6

(c) Factorise x2 +9x + 20

Mathematics
2 answers:
irina1246 [14]3 years ago
6 0

Answer:

(x + 5)(x + 4)

Step-by-step explanation:

Given

x² + 9x + 20

Consider the factors of the constant term (+ 20) which sum to give the coefficient of the x- term (+ 9)

The factors are + 5 and + 4, since

5 × 4 = 20 and 5 + 4 = 9, thus

x² + 9x + 20 = (x + 5)(x + 4)

deff fn [24]3 years ago
3 0

Answer:

Step-by-step explanation:

hello :

x² +9x + 20= (x+4)(x+5)

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Step-by-step explanation:

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At first, you have 15 bottles of coke, and you drink 2 bottles each day. After a certain number of days, there are 3 bottles lef
julia-pushkina [17]

Answer:

After 6 days, 3 bottles will be left.

Step-by-step explanation:

Given that:

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Number of bottles drank each day = 2

Let,

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y = 15 - 2d

Now,

We have to find the number of days when 3 bottles will be left.

Putting y=3

3 = 15 - 2d

2d = 15 - 3

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Dividing both sides by 2

\frac{2d}{2}=\frac{12}{2}\\d=6

Hence,

After 6 days, 3 bottles will be left.

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What is the vertex for the function f(x) = 3(x – 2)2 + 4?
Gala2k [10]

Answer:

The vertex for the function f(x) = 3(x – 2)2 + 4 is at (2, 4).

Step-by-step explanation:

Find the vertex for f(x) = 3 (x - 2)^2 + 4

f(x) = 3 (x - 2)^2 + 4 can also be written as:

y = 3 (x - 2)^2 + 4

To find critical points, first compute f'(x):

d/(dx)(3 (x - 2)^2 + 4) = 6 (x - 2):

f'(x) = 6 (x - 2)

Solve 6 (x - 2) = 0

6x - 12 = 0

6x = 12

x = 2

iI you substitute x = 2 in 3 (x - 2)^2 + 4 then you get:

y = 3 (x - 2)^2 + 4

x = 2

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Answer: The vertex for the function f(x) = 3(x – 2)2 + 4 is at ( 2, 4 ).

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