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pashok25 [27]
2 years ago
15

Plz answer quickly !!!!

Mathematics
1 answer:
SVETLANKA909090 [29]2 years ago
8 0

Im pretty sure: 18 units

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Find the number to add to x^2-18x
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Answer:

A. add 81; (x-9)^2

Step-by-step explanation:

The perfect square formula

(a-b)^2=a^2-2ab+b^2

Rewrite expression x^2-18x as follows:

x^2-2\cdot 9\cdot x

So, to form a perfect square, +9^2 is missed.

When we add 9^2=81, we will get

x^2-2\cdot 9\cdot x+9^2=(x-9)^2

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