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October 30, 2014

October 30, 2014

Posted by **Lynne** on Monday, November 1, 2010 at 9:36pm.

1. Factor Trinomial competely

x^2 + 8x + 53 (reads as x squared plus 8x plus 53) I am thinking it is prime.

2. Solve

4x^2 + 23x - 30=0

(reads 4x squared plus 23x minus 30 equals zero

- math -
**Reiny**, Monday, November 1, 2010 at 9:58pmFactoring a quadratic and solving the corresponding quadratic equation are closely related.

in the first case I would consider solving it as

x^2 + 8x + 53 = 0

since the only factors of 53 are 1 and 53 itself, there is no way we can get that 8 in the middle.

using the formula we get imaginary roots, so the thing does not factor.

2.

4x^2 + 23x - 30 = 0

just use the quadratic formula,

I got x = (-23 ± √1009)/8

- math -
**lynne**, Monday, November 1, 2010 at 10:07pmwe haven't used the quadratic formula yet. for #2 i m trying to find the factors of 30 that add to 23. not finding any..any idea

- math -
**lynne**, Monday, November 1, 2010 at 10:09pmthe second question reads as 40x squared plus 23x minus 30=0

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