(5x2 + 2x + 11) − (7 + 4x − 2x2)

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2 Answers

(5x² + 2x + 11) - (7 + 4x - 2x²)
=5x² + 2x + 11 - 7 - 4x +2x²
=5x²+2x² + 2x-4x + 11-7
=3x²-2x+4

B. 3x2 - 2x + 4

by Level 10 User (57.4k points)

Problem: (5x2 + 2x + 11) − (7 + 4x − 2x2)
Find the difference

The way to subtract like this is to multiply
the second set by -1 and then add the result.
This changes all the signs in the second set.

Notice that you are subtracting a NEGATIVE 2x2,
which is the same as ADDING 2x2.

(5x2 + 2x + 11) − (7 + 4x − 2x2)
(5x2 + 2x + 11) + (-7 - 4x + 2x2)
5x2 + 2x2 + 2x - 4x + 11 - 7
7x2 - 2x + 4

 

by Level 11 User (78.4k points)

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