Which value of a would make the following expression completely factored x2 – a ? a.12. b.36. c.49. d.81

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Which value of a would make the following expression completely factored x2 – a ? a.12. b.36. c.49. d.81

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The answer to the question is (xa) (x + a).
Solution:
xa
x + a

tua – a
x2 – tua

x2 + 0 – a or x2 -a