one more 4r^2+3r-10 I've got 4r^2+8r-5r-10 so far, but don't think its right (man I hate factoring)

Question

one more 4r^2+3r-10   I've got 4r^2+8r-5r-10 so far, but don't think its right (man I hate factoring)

anonymous · Answer

(r+2) and (r-5/4)...

anonymous · Answer

how did you get that answer?  need to know that information.

anonymous · Answer

i found the value of r by the quadratic formula and gave it in factor form...i too hate factorising. so here the shortcut!

anonymous · Answer

can you show me?  I don't understand the quadratic formula, I'm taking basic algebra and that hasn't been covered.

anonymous · Answer

$$r={-b \pm \sqrt{b^2-4.a.c}}\div2.a$$

where b iis coefficient of linear tem i.e x and a is coefficient of quadratic tem x^2 and c is the constant term

anonymous · Answer

http://en.wikipedia.org/wiki/Quadratic_equation

mertsj · Answer

|dw:1336301814008:dw|
You had a very good start.  Just finish it up by grouping the terms and factoring out the GCF.  I will show you: