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

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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 $color(blue)(a=9$

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

$9(0)=0$

$9 xx 0=0$

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