Question

Can anyone answer this ?

plz show your working as well
1) (3x2– 4x – 1) + (8x2– x + 6)
2) (6x2– x – 4) + (2x2+ 5x – 5)
3) (4x2 +2x – 5) + (6x2– x – 5)

Answer 1

1.

`(3 {x}^(2) - 4x - 1) + (8 {x}^(2) - x + 6) \\ \\ combining \: the \: like \: terms,\:we\:have\\ \\ = 3 {x}^(2) + 8 {x}^(2) - 4x - x - 1 + 6 \\ \\ = 11 {x}^(2) - 5x + 5`

2.

`(6 {x}^(2) - x - 4) + ( 2{x}^(2) + 5x - 5) \\ \\combining \: the \: like \: terms, \: we \: have \\ \\= 6 {x}^(2) + 2 {x}^(2) - x + 5x - 4 - 5 \\ \\= 8 {x}^(2) + 4x - 9`

3.

`(4 {x}^(2) + 2x - 5) + (6 {x}^(2) - x - 5) \\ \\ combining \: th e\:l ike \: terms, \: we \: have \\ \\= 4 {x}^(2) + 6 {x}^(2) + 2x - x - 5 - 5 \\ \\= 10 {x}^(2) +x - 10`

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