Rational Expression

14 ÷ 2 = 7 Remember from arithmetic that in division you can prove the answer is correct
by multipling the answer by the divisor. If the answer from this multiplication is the dividend then you have
divided correctly. Hence 2 x 7 = 14 and thus we divided correctly.

In our system of mathematics if a number is multiplied by 0 the answer is always zero.
Why does this preclude us from dividing by zero?   answer

1/t   is called a rational expression.   t = all real numbers except t ≠ 0

    This is another example of a rational expression. What values can r and t be?


In general mathematical symbolism rational expressions are defined   E/G   where E and G are polynomials
and   G ≠ 0
Which means that the variables in the denominator cannot be replaced by values that make the denominator zero.
Hence in the above example t cannot equal 3

Try another problem:  next

next page

return to TOC