1. Prove that the value of the expression a^2-a is divisible by 2 for any whole value of a.

2. Prove that the sum of three consecutive exponents of the number 2 is divisible by 14.

Question

Mathematics

Brady

24 August, 09:13

1. Prove that the value of the expression a^2-a is divisible by 2 for any whole value of a.

2. Prove that the sum of three consecutive exponents of the number 2 is divisible by 14.

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Answers (1)

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Chance Haney · Answer 1

in steps

Step-by-step explanation:

1. a² - a = a (a - 1) = (a - 1) x a

since a-1 and a are two consecutive whole number, one of them is "even" whole number. Therefore (a² - a) is divisible by 2 for any whole value of a.

2. 2ⁿ + 2ⁿ⁺¹ + 2ⁿ⁺² = 2ⁿ⁻¹ x (2 + 2² + 2³) = 2ⁿ⁻¹ x 14

So, the sum of three consecutive exponents of the number 2 is divisible by 14.

1. Prove that the value of the expression a^2-a is divisible by 2 for any whole value of a.2. Prove that the sum of three consecutive exponents of the number 2 is divisible by 14.

1. Prove that the value of the expression a^2-a is divisible by 2 for any whole value of a.

2. Prove that the sum of three consecutive exponents of the number 2 is divisible by 14.