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3 years ago

What is thr answer of (a-b) (a+2b)

Mathematics

1 answer:

kari74 [83]3 years ago

3 0

Answer:

Step-by-step explanation:

Use FOIL method

F -> First

O Outside

I inside

L Last

(a - b)(a + 2b)= a*a + a *2b + (-b)*a + (-b)*2b

= a² + 2ab - ab - 2b²

Combine like terms

= a² + ab - 2b²

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At the bookstore near Martha's home, hardcover books cost 21 dollars. The cost of a paperback book is only 4/7 of the cost of a

svlad2 [7]

Answer:

The cost of the paper book= $12

Step-by-step explanation:

Hardcover books costs $21

But paper book cost only a fraction of the hardcover book.

The paper book cost 4/7 of the hardcover book.

The cost of paper book= 4/7* paper book

The cost of paper book = 4/7*$21

The cost of the paper book= 4*3

The cost of the paper book= $12

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3 years ago

A cube has how many vertices

Ulleksa [173]

Answer: 8 vertices

Step-by-step explanation: A cube has 6 square faces. Each segment formed by the intersection of 2 faces is called an edge so a cube has 12 edges. Each point formed by the intersection of 3 edges is called a vertex so a cube has 8 vertices.

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3 years ago

Solve for m. 2= m/2 -7 M=

crimeas [40]

Answer:

m=18

Step-by-step explanation:

First add 7 to both sides.

2+7=m/2

Simplify 2+7 to 9

9=m/2

Multiply both sides by 2

9*2=m

Simplify 9*2 = 18

18=m

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3 years ago

Which number is a factor of 72

mojhsa [17]

2, 3, 4, 6, 8, 9, 12, 18, 24, 36

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4 years ago

1/3 + 2/5 A. 3/8 B. 11/15 C. 3/3 D. 3/5

Sav [38]

Answer:

$\frac{11}{15}$

Step-by-step explanation:

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

The least common multiple of 3 and 5 is 15. Convert $\frac{1}{3}$ and $\frac{2}{5}$ to fractions with denominator 15.

$\frac{5}{15}$ + $\frac{6}{15}$

Since $\frac{5}{15}$ and $\frac{6}{15}$ have the same denominator, add them by adding their numerators.

$\frac{5+6}{15}$

Add 5 and 6 to get 11.

$\frac{11}{15}$

Hope it helps and have a great day! =D

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2 years ago

What is thr answer of (a-b) (a+2b)​

What is thr answer of (a-b) (a+2b)