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amid [387]
3 years ago
10

Factorise fully : 4(x - y)^2 - 9(x + y)^2​

Mathematics
2 answers:
sergeinik [125]3 years ago
8 0

Answer:

- ( 5x + y ) ( x + 5y )

or

-5x^2 - 5y^2 - 26xy

Archy [21]3 years ago
4 0

Answer:

Step-by-step explanation:

4(x^2-2xy+y^2)-9(x^2+2xy+y^2)

4x^2-8xy+4y^2-9x^2-18xy-9y^2

-5x^2-26xy-5y^2

-5x^2-xy-25xy-5y^2

-x(5x+y)-5y(5x+y)

(-x-5y)(5x+y) or you can also remove the negative one to get

-(x+5y)(5x+y)

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If the slope of x is 3 what is the value of y when x =15
san4es73 [151]

Based on the given parameters, the value of y is 45

<h3>How to determine the value of y?</h3>

The given parameters are

Slope = 3

Value of x = 15

The value of y is calculated as:

y = Slope * x

This gives

y = 3 * 15

Evaluate

y = 45

Hence, the value of y is 45

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1 year ago
A sphere is inscribed in a cube with a volume of 8. cubic yards. What is the surface area of the sphere?​
IgorLugansk [536]

Answer:

64

Step-by-step explanation:

5 0
3 years ago
Write your number as a while number.
Reil [10]

Ans

=16

Step-by-step explanation:

=4×12/3

= 48/3

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4 0
2 years ago
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if 8 men can build a house in 90 days, in how many days can 20 men working under the same rate build the house?​
ikadub [295]

It will take 36 days for 20 men to complete the building

4 0
3 years ago
PLEASEE HELP!! I WILL MARK BRAINLIEST!
ycow [4]

The expression in scientific notation is given as follows:

3.5 x 10³.

<h3>What is scientific notation?</h3>

A number in scientific notation is given by:

a \times 10^b

With the base being a \in [1, 10).

For this problem, the expression is given by:

\frac{5 \times 10^2 \times 4.2 \times 10^4}{6 \times 10^3}

When two factors of a multiplication have the same base and different exponent, we <u>keep the base and add the exponents,</u> hence:

10^2 \times 10^4 = 10^6

5 x 4.2 = 21, hence the expression is:

\frac{5 \times 10^2 \times 4.2 \times 10^4}{6 \times 10^3} = \frac{21 \times 10^6}{6 \times 10^3}

When we divide two terms with the same base and different exponents, we keep the base and subtract the exponents, hence:

\frac{21 \times 10^6}{6 \times 10^3} = 3.5 \times 10^3

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1 year ago
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