How do we express 4 less than the square of a number?

Mathematics

2 answers:

Alex73 [517]3 years ago

7 0

Let us say we have a number x.

Square of the number x is x².

4 less means we subtract 4 from the above found expression.

So final expression becomes:

$x^{2} -4$

Svetllana [295]3 years ago

3 0

$x^{2} - 4$

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A party rental company has chairs and tables for rent. The total cost to rent 4 chairs and 8 tables is $89 . The total cost to r

puteri [66]

Let C = cost to rent each chairLet T = cost to rent each table

4C + 8T = 73
2C + 3T = 28
Multiply the 2nd equation by (-2) and then add the equations together

4C + 8T = 73
-4C - 6T = -56
2T = 17T = 17/2 = 8.5

Plug this in to the 1st equation to solve for C
4C + 8(17/2) = 73
4C + 68 = 73
4C = 5C = 5/4 = 1.25
So the cost to rent each chair is $1.25 and the cost to rent each table is $8.50

7 0

2 years ago

Read 2 more answers

<img src="https://tex.z-dn.net/?f=x1%2B2x2-x3%3D3%2C%202x1%2Bx2-2x3%3D1%2C%203x1%2B4x2-5x3%3D5" id="TexFormula1" title="x1+2x2-x

o-na [289]

Answer: x1 = 0; x2 = 5/3; x3 = 1/3

x1 + 2x2 - x3 = 3 => 2x1 + 4x2 - 2x3 = 6

2x1 + x2 - 2x3 = 1

=> 4x2 - x2 = 5

⇔ 3x2 = 5

⇔ x2 = 5/3

with x2 = 5/3, we have: x1 - x3 = 3 - 10/3 = -1/3