Bài 10:
a: \(x^2-8x+19=x^2-8x+16+3=\left(x-4\right)^2+3>0\)
b: \(=x^2-10x+25+30=\left(x-5\right)^2+30>0\)
c: \(=x^2+12x+36+64=\left(x+6\right)^2+64>0\)
d: \(=x^2+3x+\dfrac{9}{4}+\dfrac{67}{4}=\left(x+\dfrac{3}{2}\right)^2+\dfrac{67}{4}>0\)
e: \(=4x^2+4x+1+2=\left(2x+1\right)^2+2>0\)