Question

Ko làm tắt

Answer 1

c)4x²+12x+9=(2x+3)²

d)(x-y)²+3(x+y)²=x²-2xy+y²+3(x²+2xy+y²)=x²-2xy+y²+3x²+6xy+3y²=4x²+4xy+4y²

Answer 2

a) -x²+6x-9=-(x²-6x+9)=-(x-3)²

b)(x+1)²-(2x+3)²=(x+1-2x-3)(x+1+2x+3)=(-x-2)(3x+3)

Answer 3

h)x²-4x+4=(x-2)²

g)x³-125=(x-5)(x²+5x+25)

Answer 4

x²-5x=x(x-5)

Answer 5

n)x³-2x²+x-2=(x³-2x²)+(x-2)=x²(x-2)+(x-2)=(x-2)(x²+1)