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Which expression is equivalent to16x2+81? 1. (4x−9i)2 2. (4x+9i)(2x+3i)(2x−3i) 3. (4x+9i)(4x−9i) 4. (4x+9i)2
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2 votes
Which expression is equivalent to16x2+81?

1.
(4x−9i)2
2.
(4x+9i)(2x+3i)(2x−3i)
3.
(4x+9i)(4x−9i)
4.
(4x+9i)2

User Collimarco
by
8.2k points

1 Answer

3 votes
16*X² +81

The answer is 3

(4x+9i)(4x−9i) = (4x+9i)*4x -9i((4x+9i)) = 16x2 +36i -36i -81i2 = 16x² -81(-1)

= 16x² +81
User Ravinder Payal
by
8.0k points
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