Question

8. Subtract:
(a) x2 - 1 from x2 + 1
(b) 2x2 - 11x + 3 from x2 + 15x - 1
(c) 3xy + 5yz - 7zx from 5xy - 2yz - 2zx + 10xyz
(d) 30²b + 5ab-7ab2 from 20 b + Sab + 8ab2​

Answer 1

Answer:

1. (x^2+1)-(x^2-1)

x^2+1-x^2+1

1+1

2

2. (x^2+15x-1)-(2x^2-11x+3)

x^2+15x-1-2x^2+11x-3

-x^2+26x-4

3. (5xy-2yz-2zx+10xyz)-(3xy+5yz-7zx)

5xy-2yz-2zx+10xyz-3xy-5yz+7zx

2xy-7yz+5zx+10xyz

Answer 2

Step-by-step explanation:

1. 2x+1-2x+1 =2

2. 2x+15x-1- 2x2+11x-3

=2x2+28x-4

3. 5xy-2yz-2zx+10xyz-3xy-5yz+7zx

=2xy-7yz-5zx+10xyz

4. 20b+5ab+8ab2-30b2-5ab+7ab2

=20b+15ab2+30b2

=45ab2+20b