How do you factor the expression #x^2 - 49#?

Answer 1

Apply the difference of squares formula to find
#x^2 - 49 = (x+7)(x-7)#

The difference of squares formula states that #a^2 - b^2 = (a + b)(a-b)# (multiply out the right hand side to verify this)

Applying this, we have #x^2 - 49 = x^2 - 7^2 = (x+7)(x-7)#

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Answer 2

Hazel Anglin

To factor the expression (x^2 - 49), you can use the difference of squares formula, which states that (a^2 - b^2 = (a + b)(a - b)). In this case, (a = x) and (b = 7). So, the factored form of (x^2 - 49) is: [(x + 7)(x - 7)]

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.