Solve by using square roots. 3x^2-108=0?
1 Answer
Apr 29, 2018
Explanation:
#"isolate "3x^2" by adding 108 to both sides"#
#3x^2cancel(-108)cancel(+108)=0+108#
#rArr3x^2=108#
#"divide both sides by 3"#
#rArrx^2=108/3=36#
#color(blue)"take the square root of both sides"#
#rArrx=+-sqrt36larrcolor(blue)"note plus or minus"#
#rArrx=+-6#
