\(a,-7x^2+11x+6\)
\(=-7x^2-3x+14x+6\)
\(=-x\left(7x+3\right)+2\left(7x+3\right)\)
\(=\left(2-x\right)\left(7x+3\right)\)
\(b,-x^2-4x-3\)
\(=-\left(x^2+4x+3\right)\)
\(=-\left(x^2+x+3x+3\right)\)
\(=-\left[x\left(x+1\right)+3\left(x+1\right)\right]\)
\(=-\left[\left(x+3\right)\left(x+1\right)\right]\)
\(=\left(-x-3\right)\left(x+1\right)\)
\(A=-7x^2+11x+6\)
\(A=-7x^2+14x-3x+6\)
\(A=-7x\left(x-2\right)-3\left(x-2\right)\)
\(A=\left(x-2\right)\left(-7x-3\right)\)
\(B=-x^2-4x-3\)
\(B=-x^2-x-3x-3\)
\(B=-x\left(x+1\right)-3\left(x+1\right)\)
\(B=\left(x+1\right)\left(-x-3\right)\)
a, − 7x + 11x + 6
= −7x − 3x + 14x + 6
= −x 7x + 3 + 2 7x + 3
= 2 − x 7x + 3 b, − x − 4x − 3
= − x + 4x + 3
= − x + x + 3x + 3
= − x x + 1 + 3 x + 1
= − x + 3 x + 1
= −x − 3 x + 1 2 2 ( ) ( ) ( ) ( ) 2 ( 2 ) ( 2 ) [ ( ) ( )
