Question

a) A = X² - 10X+16 

b) 10x-23-x² =?

c) x² + 5x - 6 = ? 

d) ax² + bx +c =? 

xin hãy giúp mk  >_<

Answer 1

\(a,A=x^2-10x+16\)
\(=x^2-2x-8x+16\)
\(=x\left(x-2\right)-8\left(x-2\right)\)
\(=\left(x-2\right)\left(x-8\right)\)
\(b,10x-23-x^2\)
\(=-x^2+10x-23\)
\(=-\left(x^2-10x+23\right)\)
\(=-\left[\left(x^2-2.x.5+5^2\right)-5^2+23\right]\)
\(=-\left(x-5\right)^2+2\)
\(c,x^2+5x-6\)
\(=x^2-x+6x-6\)
\(=x\left(x-1\right)+6\left(x-1\right)\)
\(=\left(x-1\right)\left(x+6\right)\)


 

Answer 2

a) \(A=x^2-10x+16\)

         \(=x^2-8x-2x+16\)

         \(=x\left(x-8\right)-2\left(x-8\right)\)

         \(=\left(x-2\right)\left(x-8\right)\)

c)\(x^2+5x-6=x^2-x+6x-6=x\left(x-1\right)+6\left(x-1\right)=\left(x-1\right)\left(x+6\right)\)