Question

Productive analysis

(a+b)²-5(a+b) -6

Answer 1

Answer:

(a+b)^2-5 (a+b)-6.

a^2+b^2+2ab-5a-5b-6=0

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Answer 2

Answer:

1. A person is standing between two vertical mountains. the person fire a gun then hears the first echo from the nearby mountain in a time 3 second and here second echo from far mountain in a time 4 second. What is the distance between two mountains?

2. A boy is standing between two walls. the wall closer to him is at the distance of 680 m. if he shouts , he hears the first echo after 4 second and another after 2 second. What is the velocity of sound in air and what is the distance between two walls.