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3 years ago

PLEASE HELP!!!!! ILL MARK YOU BRAINLIEST .......>

Mathematics

2 answers:

Artemon [7]3 years ago

7 0

The answer is c because we simpple

posledela3 years ago

4 0

A (0,3) B(1,-5) C(4,-1) D(0,-6)

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Find the numbers a, b and c if the polynomial x3−18x2+24xb−c is the cube of the binomial x+2a.

mojhsa [17]

Answer:

$a=-3\\ \\b=\dfrac{9}{2}\\ \\c=216$

Step-by-step explanation:

Use formula

$(u+v)^3=u^3+3u^2v+3uv^2+v^3.$

Hence,

$(x+2a)^3=x^3+3x^2\cdot 2a+3x\cdot (2a)^2+(2a)^3=x^3+6ax^2+12a^2x+8a^3.$

This expression is equal to

$x^3-18x^2+24bx-c,$

so we can equate the coefficients at powers of x:

$x^3:\ 1=1\\ \\x^2:\ 6a=-18\Rightarrow a=-3\\ \\x:\ 12a^2=24b\Rightarrow b=\dfrac{9}{2}\\ \\1=x^0:\ 8a^3=-c\Rightarrow c=-8\cdot (-3)^3=216.$

6 0

3 years ago

Please include step by step instruction, so I can learn how to solve the problem. Thank you

Yuki888 [10]

9514 1404 393

Answer:

A, C

Step-by-step explanation:

First of all, recognize that any basic arithmetic operation between a rational number and an irrational number will have an irrational result. That means, you can eliminate any answer choices that involve an irrational number.

Fractions and mixed numbers involving integers are always rational, so you only need to look at the radicals. You know 9 is 3×3, so is a perfect square, and √9 = 3 is rational. You know 5 is not a perfect square, so √5 is irrational.

Considering the above, any expression involving √5 will have an irrational result. That means you can eliminate choices B and D.

choices A and C will result in a rational number

_____

Additional comment

A = 6.8 +0.75 = 7.55 (rational)

C = 6.8 × 0.75 = 5.100 (rational)

7 0

2 years ago

5 1/2 + 3 4/5 + 1 1/4 =

ratelena [41]

Answer:

$10\frac{11}{20}$

Step-by-step explanation:

$5\frac{1}{2} + 3\frac{4}{5} + 1\frac{1}{4}$

1.Find the LCM(Least Common Multiple).

That would be 20.

2.Multiply so all denominators are equal.

$5\frac{10}{20} + 3\frac{16}{20} + 1\frac{5}{20}$

3. Add

$9\frac{31}{20}$

4. Simplify

$10\frac{11}{20}$

6 0

1 year ago

What is 0+0? (i obviously know it but its to give out points.)

Reptile [31]

Answer:

Step-by-step explanation:

0+0=0

6 0

3 years ago

1. What is the slope of a line that passses through (-1,-5) and (6, 8)?

elena-s [515]

Answer:

Step One: Identify two points on the line.

Step Two: Select one to be (x1, y1) and the other to be (x2, y2).

Step Three: Use the slope equation to calculate slope.

4 0

3 years ago