4R^2-4R-40
2006-10-08 05:28:11 · 4 answers · asked by jro660 3 in Education & Reference ➔ Homework Help
You can take the 4 out first:
4*[r^2 -r -10]
You need to find two numbers whose product is -10 and whose sum is -1, what to we have to choose from (ignoring signs)?
(1,10) and (2,5), no whole number works.
Lets use the quadratic equation to see if I made a mistake on choices: r = 1 +/- sqrt(1 - 4*1*10)/2, well only complex solutions left so the only thing we can do is just factor out the 4.
2006-10-08 05:41:07 · answer #1 · answered by Anonymous · 0⤊ 0⤋
4(r^2-r-10)
2006-10-08 05:32:42 · answer #2 · answered by Amy Dee 2 · 0⤊ 0⤋
You really need to learn to factor yourself. You'll need it for every math from middle school until you're done with school.
2006-10-08 05:37:40 · answer #3 · answered by Stephanie 4 · 0⤊ 0⤋
R= [1+(41^0.5)]/2 and [1-(41^0.5)]/2
2006-10-08 05:32:40 · answer #4 · answered by quewkmak 2 · 0⤊ 0⤋