How do you solve #a(a-9)=0#?

Question

2951 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-03-20T13:02:35

#color(blue)(a=9#

#color(blue)(a(a-9)=0#

multiply L.H.S and R.H.S. by #1/a#

#a-9=0 xx 1/a#

#a-9=0/a=0# (example#0/2=0:.0/a=0)#

#:.a-9=0#

#:.color(blue)(a=9#

check:

substitute #color(blue)(a=9#

#color(blue)9((color(blue)9)-9=0)#

#9(0)=0#

#9 xx 0=0#