How do you solve the quadratic using the quadratic formula given #n^2=9n-20#?

Question

1640 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-11-04T06:54:06

#n=4# and #n=5#

#n^2=9n-20#

Take all the terms to the left.

#n^2-9n+20=0#

Factorise the equation.

#n^2-5n-4n+20=0#

#n(n-5)-4(n-5)=0#

#(n-4)(n-5)=0#

#n-4=0# and #n-5=0#

#n=4# and #n=5#