1.) 4 x ² + 5 x - 4
+ 2 x ² - 6 x + 4
2.) (5a -b) - (a - 4b)
3.) 2 (x 2 + 3 x + 4) + (-2 x ² - 5 x)
4.) (3a ² + a) - (5 - a)
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1.) 4 x ² + 5 x - 4
+ 2 x ² - 6 x + 4
2.) (5a -b) - (a - 4b)
3.) 2 (x 2 + 3 x + 4) + (-2 x ² - 5 x)
4.) (3a ² + a) - (5 - a)
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Answer:
1.) 4x² + 5x - 4
+ 2x² - 6x + 4
--------------------
= 6x² - x
2.) (5a - b) - (a - 4b)
= (5a - a) + (-b + 4b)
= 4a + 3b
3.) 2(x² + 3x + 4) + (-2x² - 5x)
= 2x² + 6x + 8 - 2x² - 5x
= (2x² - 2x²) + (6x - 5x) + 8
= x + 8
4.) (3a² + a) - (5 - a)
= 3a² + (a + a) - 5
= 3a² + 2a - 5