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Find the product mentally. (2m - 9)2 2m2 - 18m + 81 2m2 - 81m + 81 4m2 - 36m + 81
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Find the product mentally. (2m - 9)2 2m2 - 18m + 81 2m2 - 81m + 81 4m2 - 36m + 81
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Apr 24, 2019
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Find the product mentally. (2m - 9)2
2m2 - 18m + 81
2m2 - 81m + 81
4m2 - 36m + 81
Mathematics
high-school
Mohan Mahajan
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Mohan Mahajan
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Hi there!
• (a - b)² = a² - 2ab + b²
Simplify with th' following identity :-
(2m - 9)²
⇒ (2m)² - 2 × 2m × 9 + 9²
⇒ 4m² - 36m + 81
Hence,
4m² - 36m + 81 is Correct Option!
~ Hope it helps!
Stckvrflw
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Apr 26, 2019
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Stckvrflw
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Hi there!
Remember the following
Now we can easily work out the parenthesis using FOIL method.
First 2m × 2m = 4m^2
Outside 2m × -9 = -18m
Inside 2m × -9 = -18m
Last -9 × -9 = 81
Finally some simplifying
The third answer is correct.
~ Hope this helps you!
Darren Reid
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Apr 30, 2019
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Darren Reid
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