BriannaLovey BriannaLovey
  • 06-03-2015
  • Mathematics
Answered

What two numbers add up to 9 and multiply to -90?

Answer :

crisforp
crisforp crisforp
  • 06-03-2015
You solve the equation : t^2 - 9t - 90 = 0 ;
Δ = ( - 9 )^2 - 4 * 1 * ( - 90 ) = 81 + 360 = 441 ;
t1 = ( 9 + [tex] \sqrt{441} [/tex]) / 2 = 30 / 2 = 15 ;
t2 = ( 9 - [tex] \sqrt{441} [/tex]) / 2 = -12 / 2 = - 6 ;

The numbers are 15 and - 6 ;
Answer Link

Other Questions

The area of a rectangular wall of a barn is 55 square feet Its length is 6 feet longer than the width Find the length and width of the wall of the barn
20 is 85 of what number
What is 138 as a fraction
what is i hcf of 21 and 28
Which is an accurate description of Giovanni Caboto also known as John Cabot A the author many scholars suspect wrote most of Shakespeares plays B the French sc
Samuel Taylor Coleridges The Rime of the Ancient Mariner most reflects which romantic ideal importance of memory belief in the supernatural focus on the individ
to increase an amount by 3 what single multiplier would you use thanks
my new speakers were 15499 but I also had to pay the 6 tax what did I pay for my new speakers
HELP PLEASE 1 Irvin cut a 47 in wire into two pieces The longer piece is 13 in longer than the shorter piece What is the length of the longer piece 2 Maggie has
Twentyone students at a school have an allergy to peanuts shellfish or both Fourteen students at the school are allergic to peanuts Twelve students at the schoo