Question

factories the following 81- 4z²​

Answer 1

Step-by-step explanation:

$\sqrt{81 - 4z {}^{2} }$

$9 - 2z$

Answer 2

Answer:

9-2z

Step-by-step explanation:

81-4z^2

=(9)^2-2^2z^2

=9 - 2z (a^2 - b^2)

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