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2 years ago

Solve by factoring x^2-8x-20-0

Mathematics

2 answers:

agasfer [191]2 years ago

6 0

Answer:

(x-10)(x+2)

Step-by-step explanation:

Oksana_A [137]2 years ago

5 0

X^2-8x-20 and if you rewrite that it’s (x-10) (x+2)

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given that a1=5 and a2=15 are the first two terms of a geometric sequence, determine the values of a3 and a10. Show the calculat

Alekssandra [29.7K]

a_3 is 45 and a_10 is 98415

Step-by-step explanation:

Given

a_1 = 5

a_2 = 15

First of all we have to calculate the common ratio of the sequence. The common ratio is the ratio between two consecutive terms of a geometric sequence.

So,

$r=\frac{a_2}{a_1} = \frac{15}{5} = 3$

The explicit formula for geometric sequence is:

$a_n = a_1.r^{n-1}$

Putting the value of r and a_1

$a_n = 5.(3)^{n-1}$

Putting n=3 in the explicit formula

$a_3 =5.3^{3-1}\\= 5 * 3^2\\=5 * 9\\= 45$

Putting n=10 for tenth term

$a_{10} =5.3^{10-1}\\=5*3^9\\=5 * 19683\\=98415$

Hence,

a_3 is 45 and a_10 is 98415

Keywords: Geometric sequence, Explicit formula

Learn more about geometric sequence at:

#LearnwithBrainly

7 0

3 years ago

Answer choices a. -4/3 b. -3/4 c. 3/4 d. 4/3

Bingel [31]

Answer:

Step-by-step explanation:

(0, 1) (4, -2)

(-2 - 1)/(4 -0) = -3/4

7 0

2 years ago

Simplify (-2√20k)(5√8k^3) completely

RSB [31]

Answer:

-40 square root of 10k²

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

X+y=2 8x+3y=-19 substitution

padilas [110]

Answer:

{x,y}={−5,−7}

Explain:

// Solve equation [2] for the variable y [2] 3y = 7x + 14 [2] y = 7x/3 + 14/3 // Plug this in for variable y in equation [1] [1] 8x - 3•(7x/3+14/3) = -19 [1] x = -5 // Solve equation [1] for the variable x [1] x = - 5 // By now we know this much : x = -5 y = 7x/3+14/3 // Use the x value to solve for y y = (7/3)(-5)+14/3 = -7 Solution : {x,y} = {-5,-7}

Hoped I helped

4 0

2 years ago

Read 2 more answers

Y 47 27 2+ -2 -2 1 2 What is the slope of the line

Kryger [21]

Answer:

answer =3/4

use m= y2-y1/x2-x1

3 0

3 years ago