Algebraeasy · Past Paper
Find the factors of a^2 - 25b^2.
A(a-5b)(a-5b)
B(a+5b)(a+5b)
C(a+5b)(a-5b)
D(a+25b)(a-b)
✓ Correct Answer: C — (a+5b)(a-5b)
Using the formula a^2 - b^2 = (a-b)(a+b), where b is replaced by 5b, we get (a-5b)(a+5b).
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