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Sagot :
Answer:
see below
Step-by-step explanation:
We want x² - 100.
- A (x - 90) + (x - 10)
We are adding these two binomials. Already we should recognize that adding these will not result in x².
–No–
- B (x - 9)² - 19
We want to expand the binomial first.
(x - 9)(x - 9) - 19
Multiply using FOIL.
(x² - 9x - 9x + 81) - 19
Simplify.
x² - 18x + 81 - 19
x² - 18x + 62
–No–
- C x(x - 100)
Distribute the x.
x² - 100x
–No–
- D (x + 10)(x - 10)
FOIL
x² - 10x + 10x - 100
Simplify.
x² - 100
–Yes–
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