Question

Bài 2

a)\(x^2+6x+8\)

b)\(x^2-10x+16\)

c)\(x^2-8x+15\)

Answer 1

a) x² + 6x + 8

= x² + 2x + 4x + 8

= (x² + 2x) + (4x + 8)

= x(x+2) +4(x+2)

=(x+4)(x+2)

b) x² - 10x +16

= x² - 2x - 8x + 16

= (x² -2x) -(8x -16 )

=x(x-2)-8(x-2)

=(x-8)(x-2)

c)x² -8x +15

=x² -3x - 5x +15

=(x² -3x) -(5x-15)

=x(x-3)-5(x-3)

=(x-3)(x-5)