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Inessa05 [86]
3 years ago
6

4. Multiply or divide : i) (a+b) (a-b) ii) (4b +5a) ÷ 2 b​

Mathematics
1 answer:
IgorC [24]3 years ago
4 0

Answer:

1. a²-b²

2.4b² + 5ab/2

Step-by-step explanation:

1:. it's a formula of a²-b² so, it can be solved like this and

2: I'm not sure about 2nd one

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Expand (3x+7)(3x-7) =
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Answer:

9 {x}^{2}  - 49

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Do FOIL, first outside inside last

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Rewrite the expression using the GCF and distributive property. (110-44)
Afina-wow [57]

let me divide your question into two parts A and B as;

A.Rewrite the expression using the GCF and distributive property. (110-44)

B.how many 24-foot jump ropes can be made from a rope that is 100 feet long?

Answer:

A.(110-44)=22(5-2)

B. 4 jump ropes of 24 feet length

Step-by-step explanation:

A.Rewrite the expression using the GCF and distributive property. (110-44

Answer:

Find the GCF of 110 and 44 then take that GCF as common factor out of (110-44) then we can get new expression for (110-44) as 22(5-2) i.e.

prime factorization of 110=2x5x11

and 44=2x2x11

GCf is the product of factors that appear in both of the prime factorization which is 2x11=22

thus using GCF (22) as common factor we can rewrite the given expression as

22(5-2) which is distributive law of multiplication over subtraction.

B.how many 24-foot jump ropes can be made from a rope that is 100 feet long?

Answer:

Given

Total length of the rope =100 feet

length of a jump rope =24

solution:

For one jump-rope we need 24 feet

For two jump-ropes we need 48 feet

For three jump-ropes we need 72 feet

For four jump-ropes we need 96 feet

thus from a 100 feet long rope we can make 4 jump-ropes of 24 feet length with 6 feet remaining as extra.

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