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Komok [63]
3 years ago
7

Factor completly: x^2-2x-24

Mathematics
2 answers:
lions [1.4K]3 years ago
8 0

Answer:

(x+4)(x−6)

Step-by-step explanation:

Factoring x2−2x−24

x2−2x−24

The middle number is -2 and the last number is -24.

Factoring means we want something like

(x+_)(x+_)

Which numbers go in the blanks?

We need two numbers that...

Add together to get -2

Multiply together to get -24

Can you think of the two numbers?

Try 4 and -6:

4+-6 = -2

4*-6 = -24

Fill in the blanks in

(x+_)(x+_)

with 4 and -6 to get...

(x+4)(x-6)

melisa1 [442]3 years ago
4 0
<span>x^2-2x-24 = (x - 6)(x + 4)

cause
</span>(x - 6)(x + 4)
= x^2 - 6x + 4x - 24
= x^2 - 2x - 24

answer
(x - 6)(x + 4)

hope it helps
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Complete the square for the expression, then factor the trinomial.
Nuetrik [128]

Answer:

Completing the square we get: (x-2)^2-(2)^2

and factoring the term we get: x(x-4)

Step-by-step explanation:

We need to complete the square for the expression x^2-4x

For completing the square the expression would be of form a^2+2ab+b^2=(a+b)^2

For given expression we have to add (2)^2 and subtract to make it complete the square.

x^2-2(x)(2)+(2)^2-(2)^2\\(x-2)^2-(2)^2

Now, we have to factor the polynomial using formula (a)^2-(b)^2=(a-b)(a+b)

So, (x-2)^2-(2)^2\\=(x-2-2)(x-2+2)\\=(x-4)(x-0)\\=x(x-4)

Completing the square we get: (x-2)^2-(2)^2

and factoring the term we get: x(x-4)

5 0
3 years ago
Lucy graphed the equations x + 9 y = 5 and 4 x + 15 y = negative 1 and saw that they intersected at the point (–4, 1) as shown.
aleksandrvk [35]

Answer: A

Step-by-step explanation:

You can solve a system of equations by graphing, elimination, substitution, or using a combination. The graph of a linear equation is a line. The point(s) where one line intersects another is the solution to the system. Therefore, since Lucy found that the lines intersected at the point (-4, 1), it is the solution to the system of linear equations

7 0
2 years ago
Perfect square trinomial:
Dennis_Churaev [7]

Answer:

k² - 18k + 81

Step-by-step explanation:

Using the given model then

(k - 9)² with a = k and b = 9

= k² - 2(k)(9) + 9²

= k² - 18k + 81

3 0
2 years ago
Triangle abc is similar to xyz. which proportion can be used to find the unknown side length
Alex17521 [72]

Unknown side length of two similar triangles can be found out by scale factor and any of the side lengths.

Step-by-step explanation:

The similarity is one of the criteria of triangles. Two triangles are similar when their respective sides are in similar ratio or proportion. In layman’s term, it can be understood as a condition in which two triangles have similar shapes but not similar sizes.

If ΔABC is similar toΔ XYZ, then their respective sides would be in proportion to each other.

This means AB/XY=AC/XZ=BC/YZ

This common ratio is often termed as “scale factor”

Hence any sides length can be found out if either of the terms (i.e. scale factor, side ) is given.

7 0
3 years ago
Which are the solutions of x2 = –13x – 4? 0, 13 0, –13
Shkiper50 [21]
Rewrite in quadratic form:
x² + 13x + 4 = 0 
The best approximations, given the options, are 0 and -13
The actual solution is -0.3 and -12.7
5 0
3 years ago
Read 2 more answers
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