Posted by becca on Tuesday, January 17, 2012 at 11:03pm.
solve with an exact answer.
x^2 + 2x - 8
- Quadraitic equations - drwls, Tuesday, January 17, 2012 at 11:29pm
Start by factoring
(x+4)(x-2) = 0
The equation is true if either factor is zero.
x = +__ or -___
- Quadraitic equations - becca, Tuesday, January 17, 2012 at 11:31pm
Can you show me the steps please???? to solve this equation.
- Quadratic equations - drwls, Tuesday, January 17, 2012 at 11:44pm
I just did. The final answer is 2 or -4. Do you understand how to factor equations? That might be a topic worth reviewing.
If you wan to do it the hard way, you can also use the quadratic equation
x = [-b +/-sqrt(b^2-4ac)]/(2a)
Then substitute a = 1, b = 2 and c = -8
sqrt(b^2 -4ac) = sqrt36 = 6
x = (1/2)*[-2 +/-6]
= (1/2)(4 or -8)
= 2 or -4
- Quadraitic equations - becca, Tuesday, January 17, 2012 at 11:51pm
Thank you so much and I definetly need to review how to factor equations<<<good night and sweet dreams>>>thank you for helping me
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