Bảy hằng đẳng thức toán 8

What is the expanded form of (A + B)^2?

• A^2 + B^2

• A^2 - 2AB + B^2

• A^2 + 2AB + B^2

• A^2 + AB + B^2

What is the expanded form of (2x - 3y)^2?

• 4x^2 - 9y^2

• 4x^2 - 12xy + 9y^2

• 4x^2 + 12xy + 9y^2

• 2x^2 - 6xy + 3y^2

Expand the expression (3x + 1)^2.

• 9x^2 + 3x + 1

• 9x^2 + 6x + 1

• 3x^2 + 6x + 1

• 9x^2 + 6x + 2

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Factor the expression a^2 + 10ab + 25b^2 into the square of a sum or a difference.

• (a - 5b)^2

• (a + 25b)^2

• (a + 5b)^2

• (a^2 + 5b)^2

A square garden with a side length of 10 meters is expanded by adding 'x' meters to both sides. What is the expression for the area of the garden after expansion?

• x^2 + 100

• x^2 + 20x + 100

• 10x + x^2

• 100 + x