Restrictions on reducing to lowest terms

Reference no: EM13119854

Reduce to lowest terms.

(w^2 - 49) / (w + 7)

The given expression is called a rational expression because both numerator and denominator are polynomials. A rational expression is not defined for those values of the variable that make the denominator 0. Thus, the expression (w^2 - 49)/(w + 7) is defined only when w + 7 ≠ 0, that is, when w ≠ -7.

To simplify a rational expression, we attempt to factorize the numerator and the denominator so that common factors, if any, can be canceled.

Now, w^2 - 49 = w^2 - 7^2 = (w + 7)(w - 7)

∴ (w^2 - 49)/(w + 7) = [(w + 7)(w - 7)]/(w + 7)

= w - 7 [Canceling the common (w + 7) term]

Thus, the given expression simplifies to w - 7 and this is the answer.

Why do you think the expression is undefined when w = -7? Why is zero in the denominator a problem?

Reference no: EM13119854

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