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Multiplication or division of two numbers of opposite signs: negative*positive, positive*negative, negative/positive, and positive/negative.
Addition of two negative numbers: -5 + -2 = -7
Multiplying pure imaginary numbers of the same 'sign' : 5i * 2i = -10. -3i * -4i = -12.
Dividing pure imaginary numbers of different signs (this comes from the fact that 1/i = -i, and i/i = +1)
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Why does a negative number times a negative number produce a positive number?
Negative times negative is always a positive.
Is a positive number and a negative number will always be negative?
A positive number multiplied by a negative number will always result in a negative number.
When a negative number is subtracted from a positive number is the difference always positive?
Yes, a negative number subtracted from a positive number will always be positive. Subtracting a negative number is the same as adding the opposite of the negative number. The opposite of a negative number is always positive. A positive number plus a positive number is always positive.
Is a negative number plus a positive number always negative?
No.
What does a negative number plus a negative number equal?
A negative plus a negative still gives a negative answer.
