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3 years ago

Evaluate the expression 2ab3 + 6a3 - 4ab2 when a = 2 and b = 4.

Mathematics

2 answers:

evablogger [386]3 years ago

7 0

2(2)(4)3+6(2)3-4(2)(4)2
48 + 36 - 64
74 - 64
= 10

nalin [4]3 years ago

3 0

2(2x4)3 + 6(2)3 - 4(2x4)2
(4x8)3 + (12)3 - (8x16)2
(32)3 + (12)3 - (128)2
96 + 36 - 256
-124

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What is mean in math

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3 years ago

10 points! How do I factor 8x^2-26x+15

Rufina [12.5K]

The AC method, also known as splitting the middle, can be shown like this:

8x^2 - 26x + 15

Check factors of 120.

1 * 120

-1 * -120

2 * 60

-2 * -60

3 * 40

-3 * -40

5 * 24

-5 * -24

6 * 20

-6 * -20 (these factors, when added together, are equal to the middle term, and thus splitting the middle term is possible.)

Split the middle term.

8x^2 - 6x - 20x + 15

Group in terms of 2.

(8x^2 - 6x) - (20x + 15)

Factor each binomial.

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Rearrange the terms.

(2x - 5)(4x - 3)

6 0

4 years ago

Read 2 more answers

What fraction of an hour is 18 minutes? Give your answer in its simplest form.

enot [183]

Answer:

3/10

Step-by-step explanation:

An hour is 60 mins

so the fraction would be 18/60

Then you can divide both numbers by 6 to 3/10

4 0

3 years ago

Read 2 more answers

PLS HELP :( Solve the inequality and graph the solution on the line provided.

Travka [436]

Answer:

$x\leq -1$

Step-by-step explanation:

1. $7x\leq 7-14$

2. $7x\leq -7$

3. divide both sides by 7

4. $x\leq -1$

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3 years ago

The sum of twice a number and 12 is no less than 24

noname [10]

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3 years ago