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a^2 + 4a - 17
3a^2 - 4a + 4 [ + ]
____________________
4a^2 + 0 - 13 =
4a^2 - 13
A - b =
a^2 + 4a - 17
3a^2 - 4a + 4 [ - ]
____________________
-2a^2 + 8a - 21
2.) A + b =
2x^2 - 5x - 2
7x + 8 [ + ]
___________
2x^2 -2x + 6
A - b =
2x^2 - 5x - 2
7x + 8 [ - ]
___________
2x^2 - 12x - 10
jawab:
1.A+B=a²+4a-17 + 3a²-4a+4
=a²+3a² + 4a-4a -17+4
=4a² - 13
A-B=a²+4a-17 - (3a²-4a-4)
=a²-3a² + 4a-(-4a) - 17-4
=-2a² + 8a - 21
2.A+B=2x²-5x-2 + 7x+8
=2x² - 5x+7x - 2+8
=2x² + 2x + 6
A-B=2x²-5x-2 - (7x+8)
=2x² - 5x-7x - 2-8
=2x² - 12x - 10