Answer:
a = ±10/9
Step-by-step explanation:
[tex]-100+81a^2=0\\81a^2=100\\a^2=\frac{100}{81}\\\sqrt{a^2}=\sqrt{\frac{100}{81} }\\a=10/9\\a=-10/9[/tex]
GOOD MORNING AND CONGRATULATIONS ON YOU GRADUATING :D
