Question

câu 1,6,8,12,13

Answer 1

1)x²+7x+10=x(x+5)+2(x+5)=(x+5)(x+2)

6)x²-10x+24=x(x-4)-6(x-4)=(x-4)(x-6)

8)x²-10x+21=x(x-3)-7(x-3)=(x-3)(x-7)

12)x²-8x-20=x(x+2)-10(x+2)=(x+2)(x-10)

13)3x²-7x-6=x(3x+2)-3(3x+2)=(3x+2)(x-3)

Answer 2

1: \(x^2+7x+10=\left(x+2\right)\left(x+5\right)\)

6: \(x^2-10x+24=\left(x-4\right)\left(x-6\right)\)

8: \(x^2-10x+21=\left(x-3\right)\left(x-7\right)\)

12: \(x^2-8x-20=\left(x-10\right)\left(x+2\right)\)

13: \(3x^2-7x-6=\left(3x+2\right)\left(x-3\right)\)

Answer 3

1.x²+7x+10= x²+5x+2x+10=(x²+5x)+(2x+10)=x(x+5)+2(x+5)

6.x²-10x+24=x²-4x-6x+24=(x²-4x)-(6x+24)=x(x-4)+6(x-4)=(x-4)(x+6)

8.x²-10x+21=x²-3x-7x+21=(x²-3x)-(7x+21)=x(x-3)+7(x-3)=(x-3)(x+7)

12.x²-8x-20=x²-10x+2x-20=(x²-10x)+(2x-20)=x(x-10)+2(x-10)=(x-10)(x+2)

13.3x²-7x-6=3x_²-9x+2x-6=(3x²-9x)+(2x-6)=3x(x-3)+2(x-3)=(x-3)(3x+2)