Question

Solve the equation x^(2)-8x=9 and calculate the sum of the solutions

Answer 1

You will have two solutions

x = 9, -1

Explanation:

`x^(2)` -8x - 9 = 0 You can factor this

(x -9)(x +1) = 0

x = 9,-1

Helping in the name of Jesus.

Answer 2

Related Concepts

• Quadratics

Solution

`x^2-8x=9`

Move 9 to the other side:

`x^2-8x-9=0`

Factor by grouping:

`x^2+1x-9x-9=0\\x(x+1)-9(x+1)=0\\(x-9)(x+1)=0`

Thus, x = -1 or x = 9.

The sum of the solutions is 8.