Question

7hằng đẳng thức.

x² + 4x + 4=

4x² - 4x + 1=

4x² + 12x +9=

9x² + 30x +25=

4x² - 20x + 25 =

Answer 1

a. \(x^2+4x+4=x^2+2\cdot x\cdot2+2^2=\left(x+2\right)^2\)

b. \(4x^2-4x+1=\left(2x\right)^2-2\cdot2x\cdot1+1^2=\left(2x-1\right)^2\)

c. \(4x^2+12x+9=\left(2x\right)^2+2\cdot2x\cdot3+3^2=\left(2x+3\right)^2\)

d. \(9x^2+30x+25=\left(3x\right)^2+2\cdot3x\cdot5+5^2=\left(3x+5\right)^2\)

e. \(4x^2-20x+25=\left(2x\right)^2-2\cdot2x\cdot5+5^2=\left(2x+5\right)^2\)

Answer 2

\(x^2+4x+4=\left(x+2\right)^2\)

\(4x^2-4x+1=\left(2x-1\right)^2\)

\(4x^2+12x+9=\left(2x+3\right)^2\)

\(9x^2+30x+25=\left(3x+5\right)^2\)

\(4x^2-20x+25=\left(2x+5\right)^2\)

tik mik nha

Answer 3

giải

x^2+4x+4

=x^2+2.x.2+2^2

Answer 4

1)x² + 4x + 4= x² + 2.x.2 + 2²

Answer 5

4x^2+12x+9

2x^2+2.2x.3+3^2

Answer 6

9x^2+30x+25

=3x^2+2.3x.5+5^2

Answer 7

4x^2-20x+25

=2x^2-2.2x.5+5^2=(2x-5)^2

Answer 8

4x^2-4x+1

=2x^2-2.2x.1+1^2=(2x-1)