3 years ago

For all real numbers a and b, 2a • b = a2 + b2. True or False ? Explain.

Mathematics

2 answers:

vekshin13 years ago

8 0

False. You can pick any two numbers, but not the same number, to show its false. try it

kvv77 [185]3 years ago

5 0

First step of the equation is to simplify the equation 2a • b = a2 + b2 into 2 ab = a2 + b2. This cannot be factored anymore although. when we try to substitute a with 5 and b with 2, the answer in the right hand side of the equation is -9. hence the answer to this problem is false. we can try another values to verify

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A bag contains 28 blue marbles and 12 red marbles. If Milton removes two marbles without replacing them, what is the probability

Daniel [21]

The probability the first marble will be blue is 28/40
The probability the second marble will be red is 12/39
The reason is because 28 + 12 = 40, so this makes the denominator for our first outcome, but then a marble is removed making our denominator 39 because 40-1 = 39.

4 0

3 years ago

Solve for n: -6(n -8) = 4(12 -5n) + 14n.

Alexxx [7]

Answer:

infinite solutions

Step-by-step explanation:

Given

- 6(n - 8) = 4(12 - 5n) + 14n ← distribute parenthesis on both sides

- 6n + 48 = 48 - 20n + 14n, that is

- 6n + 48 = 48 - 6n ( add 6n to both sides )

48 = 48 ← True