. Use the number line to illustrate the difference: -3-(-7)
2 answers:
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Answer:
see explanation
Step-by-step explanation:
12
Since the denominators are like, add the numerators leaving the denominator
=
=
15
We require the denominators to be like before we can add.
factor x² - 4 as a difference of squares
x² - 4 = (x + 2)(x - 2)
Expressing as
+
multiply the numerator/denominator of the first fraction by (x - 2)
= +
Expand and simplify the numerators, leaving the denominator
=
=
