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3 years ago

Factorise (x+y)^2-(4-x)^2

Mathematics

1 answer:

vovikov84 [41]3 years ago

4 0

Answer:

by using the identity a square - b square = (a+b)*(a-b)

a = x+y

b=4-x

= (x+y + 4-x)(x+y - 4-x)

y+4 * x+y -4+x

y+4*2x+y-4

2xy+y square -4y + yx + 4x + 4y - 16 +4x

3xy +y square + 8x -16

Step-by-step explanation:

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2 years ago

What’s the answer please help

noname [10]

Answer:

$\boxed{\text{A. }\math{\left \{ x \, | \, x \in \mathbb{R}, x < -2 \right \}}}}$

Step-by-step explanation:

The open circle means that the point is not included in the solution set, and the arrow pointing left means that all numbers less than -2 are members.

In set-builder notation, each term has a special meaning. The braces enclose the members of the set.

Here's how you translate the notation,

$\begin{array}{rcl}\\\left \{ & = & \text{The set of}\\x & = & \text{all x values}\\| & = &\text{such that}\\x & = & x\\\in & = &\text{is a member of}\\\mathbb{R}, & = &\text{all real numbers, and}\\x < -2 & = & \text{x is less than -2}\\\end{array}\\\text{The answer is }\boxed{\textbf{A. }\mathbf{\left \{ x \, | \, x \in \mathbb{R}, x < -2 \right \} }}}$

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3 years ago

A football field is 100 yards long and 60 yards wide. Whats the length of a diagonal of the football field

maria [59]

Answer:

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Step-by-step explanation:

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3 years ago

1 point

lara [203]

Answer:

V=20 in cubed

Step-by-step explanation:

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Hope that helped! If you have any further questions please message me! Good luck!

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3 years ago

Point (k, -3) lies on the line whose equation is x-2y=-2. What is the value of k?

natita [175]

Answer:

Substitute, <em><u>y = -3</u></em> and <em><u>x = k</u></em> on the equation.

=> k - 2×(-3) = -2

=> k = -2 + (-6)

=> k = - 8

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7 0

2 years ago

Factorise (x+y)^2-(4-x)^2​

Factorise (x+y)^2-(4-x)^2