Question

Simplify the algebraic expression: 7x2 + 6x – 9x – 6x2 + 15.

A. x2 – 3x + 15
B. x4 – 3x + 15
C. x2 + 15x + 15
D. 13x2 + 3x + 15

Answer 1

A.
`x^(2) - 3x +15`

Explanation:

Given:

7x^2 + 6x – 9x – 6x^2 + 15.

On combining the x^2, and "x" terms we get,

= (7x^2 – 6x^2) + (6x – 9x) + 15

Now, here simple addition of integers takes places

= x^ - 3x + 15

Answer 2

The correct answer option is A. x2 – 3x + 15.

Explanation:

We are given the following expression and we are supposed to simplify it:

`7x^2+6x-9x-6x^2+15`

Before solving it, a good idea will be to arrange all the like terms together in their decreasing power and write the expression as:

`7x^2-6x^2+6x-9x+15`

Simplifying it to get:

`x^2-3x+15`

Therefore, the first option A is the correct answer x2 – 3x + 15.