Question 58342
-X^2=10X-21
-X^2-10X+21=0
X^2+10X-21=0
USING THE QUADRATIC EQUATION WE GET
X=(-10+-SQRT(100-4*-21))/2
X=(-10+-SQRT(100+84))/2
X=(-10+-SQRT184)/2
X=(-10+-13.56)/2
x=(-10+13.56)/2
x=3.56/2
x=1.78
and
x=(-10-13.56)/2
x=-23.56/2
x=-11.78