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What's the X-Intercepts of (2x-5)(x+1)=9 or (2x-5)(x+1)-9

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2 votes

Answer:

Explanation:

Either way works. It comes to the same thing.

(2x-5)(x+1)=9

F: 2x*x = 2x^2

O: 2x*1 = 2x

I: -5 * x = -5x

L: -5*1 = -5

2x^2 + 2x - 5x - 5 = 9 Subtract 9 from both sides

2x^2 - 3x - 14 =0 Divide by 2 (it makes life easier).

Factoring you get

(2x - 7)(x + 2)

2x - 7 = 0

2x = 7

x = 3.5

x + 2 = 0

x = -2

The x intercepts = (3.5,0) and (-2,0)

I've put a graph up for the given equation.

What's the X-Intercepts of (2x-5)(x+1)=9 or (2x-5)(x+1)-9-example-1
User CharlesW
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