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Umnica [9.8K]
3 years ago
9

Factorise x2 + 13x + 42

Mathematics
1 answer:
kirill [66]3 years ago
8 0

Answer:

you can use the formula "<em>Cross method" </em>  in which the last number of the equation is the sum of 2 number multiplication that also sums the 2nd num of the equation.

so it becomes

(x +6)(x +7)

WHY?

Bcs when u multiply 6 x 7 = 42 ( the last number of the equation)

      when u sum 6 + 7 = 13 ( the 2nd number of the equation)

Hope this helps :)

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For breakfast perry adds 1/8 cups of berries to his oatmeal.He has 7/8 cup of berries in his fridge.How many days can he have br
prisoha [69]

Answer:

He has 7 days

Step-by-step explanation:

He consumes 1/8 cups of berries per day, 1/8=1 day

He has 7/8 cups of berries

To get the number of days it takes for 7/8 cups

Number of days=(Number of cups of berries he has)/(The number of berries he consumes in a day)

(7/8)÷(1/8)=(7/8)×8=7 days

4 0
3 years ago
Evaluate the following expression, when n=-3 and r=-8<br> −5 + 3(−2r + 4n) <br> Pease answer ASAP
Hunter-Best [27]

Answer:

-8

Step-by-step explanation:

Given that,

n = -3

r = -8

Now we have to find the value of the given expression.

For that, you have to replace n and r with ( -3 ) and  ( -8 ) respectively.

Let us solve now.

−5 + 3 ( −2r + 4n )

-5 + 3 ( -2 × -8 + 4 × -3 )

-2 ( 16 - 12 )

-2 × 4

-8

Let me know if you've any other questions. :-)

- Hi1315

3 0
2 years ago
What is the value of v? v/-8=v 4?
Ray Of Light [21]
V/-8 = 4v
V= -32v
V+32v=0
33v=0
V=0
8 0
3 years ago
Read 2 more answers
For f(x) = √x-3 find f(f^-1(4))
vlada-n [284]

Answer:

4

Step-by-step explanation:

f⁻¹(x) = x²+3, but none of that matters, since f(f⁻¹(x)) = x

3 0
3 years ago
How do i solve the equation 5n+4=-26  
ozzi
You do 

-26
-4
---
-30

5n=-30 so...

-30/5=-6

Therefore 
n=-6
3 0
3 years ago
Read 2 more answers
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