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zubka84 [21]
3 years ago
11

What is the answer to (7k+8)(7k-6)

Mathematics
2 answers:
marishachu [46]3 years ago
5 0
(7k+8)(7k-6)
=49k²+56k-42k-48
=49k²-12k-48 This is the answer if you want it expanded

K=(-8/7) , (6/7) answer if the equation is equal to 0
Gennadij [26K]3 years ago
4 0
7k•7k-7•6k+7•8k-8•6=
49k^2 -42k+56k-48=
49k^2 -14k-48
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The distance travelled in (m) by a ball dropped from a height are 128/9,32/3,8,6,...
Allushta [10]

Answer: it will trave 56.89 meters before coming to rest.

Step-by-step explanation:

This is a geometric progression since the distance travelled (height) by the ball is reducing by a constant ratio, r. Since the number of times that the ball will bounce is infinite, then we would apply the formula for determining the sum of the terms in a geometric progression to infinity which is expressed as

S = a/(1 - r)

where

S = sum of the distance travelled by the ball

a = initial distance or height of the ball

r = common ratio

From the information given,

a = 128/9

r = (32/3)/(128/9) = 0.75

Therefore,

S = (128/9)/(1 - 0.75) = 56.89 meters

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Step-by-step explanation:

32+15x−42

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