1.
10a – 8b
(-) 4a + 5b
2.
5b + 3c
(-) 4b + 3c
3.
6d + 6e
(-) 9d – 8e
4.
8x – 3y
(-) -4x + 8y
5.
6rs – 7bc
(-) 9rs – 7bc
6.
5xy – 9cs
(-)-3xy + cs
7.
x2 – 6x + 5
(-) 3x2– 2x – 2
8.
3y2 – 2y – 1
(-) -5y2– 2y + 6
9.
(7a + 6b – 9c) – (3a – 6c)
10.
(x2 – 9) – (-2x2 + 5x – 3)
11.
(5 – 6d – d2) – (-4d – d2)
12.
(-4x + 7) – (3x – 7)
13.
(4a – 3b) – (5a – 2b)
14.
(2c + 3d) – (-6d – 5c)
15.
(5x2 + 6x – 9) – (x2 – 3x +7)
16.
(3y – 6) – (8 – 9y)
17.
(3a2 – 2ab + 3b2) - (-a2 – 5ab + 3b2)
18.
5c – [8c – (6 – 3c)]
19.
10x + [3x – (5x – 4)]
20.
3x 2 – [7x- (4x – x2) + 3]
21.
x2 – [ - 3x+ ( 4 – 7x)]
Some one please help I don't understand how to do this it says to subtract the polynomials but I don't understand!
2 answers
#20
3x^2 – [7x- (4x – x^2) + 3]
= 3x^2 - [7x-4x+x^2+3]
= 3x^2 - [x^2+3x+3]
= 3x^2-x^2-3x-3
= 2x^2-3x-3
You can see this at this url:
http://www.wolframalpha.com/input/?i=3x^2+%E2%80%93+[7x-+%284x+%E2%80%93+x^2%29+%2B+3]
now type in your other expressions to verify your answers.