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x=-11 OR x=10
So, x2+x=110, or x2+x-110=0. Use the quadratic formula to solve for x
x=((-1)+/-sqrt((-1)2-4*(1)(-110)))/(2(1))
x=((-1)+/-sqrt(441))/(2)
x=((-1)+/-21)/(2)
x=-22/2 OR x=20/2
x=-11 OR x=10
Alternatively, you can recognize that x2+x-110=0 can be factored into (x+11)(x-10)=0, which yields the same result.
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