If x2-5=10 ,x=?
J JeffM Elite Member Joined Sep 14, 2012 Messages 7,875 Feb 2, 2013 #2 girlpower said: If x2-5=10 ,x=? Click to expand... This is another quadratic equation that simplifies to \(\displaystyle x^2 - 5 = 10 \implies x^2 - 5 + 5 = 10 + 5 \implies x^2 = 15.\) Let's take an easier example. \(\displaystyle y^2 = 9.\) What positive number when squared = plus 9? What negative number when squared = plus 9?
girlpower said: If x2-5=10 ,x=? Click to expand... This is another quadratic equation that simplifies to \(\displaystyle x^2 - 5 = 10 \implies x^2 - 5 + 5 = 10 + 5 \implies x^2 = 15.\) Let's take an easier example. \(\displaystyle y^2 = 9.\) What positive number when squared = plus 9? What negative number when squared = plus 9?
