Quiz about 多項式的乘法

Question 1

$$\left(x+4\right)\left(x-4\right)=?$$

Accepted Answer

$$x^2-16$$

Answer

$$x^2-8$$

Answer

$$x^2-8x+16$$

Answer

$$x^2+8x-16$$

Question 2

$$\left(3x-1\right)\left(3x+1\right)=?$$

Accepted Answer

$$9x^2-1$$

Answer

$$3x^2-1$$

Answer

$$6x^2-2$$

Answer

$$9x^2-6x+1$$

Question 3

$$\left(2x+3\right)^2=?$$

Accepted Answer

$$4x^2+12x+9$$

Answer

$$4x^2+9$$

Answer

$$8x^2+6$$

Answer

$$5x^2$$

Question 4

$$\left(3x-5\right)^2=?$$

Accepted Answer

$$9x^2-30x+25$$

Answer

$$9x^2-25$$

Answer

$$3x^2-15x+10$$

Answer

$$9x^2-30x-25$$

Question 5

$$\left(4x+3\right)\left(4x-3\right)=?$$

Accepted Answer

$$16x^2-9$$

Answer

$$4x^2-9$$

Answer

$$8x^2-6$$

Answer

$$4x^2-12x-9$$

Question 6

$$\left(x+1\right)\left(2x-3\right)=?$$

Accepted Answer

$$2x^2-3x+2x-3$$

Answer

$$2x^2-3$$

Answer

$$2x^2+3x-2x-3$$

Answer

$$2x\cdot\left(-x\right)$$

Question 7

$$\left(3x-2\right)\left(2x-1\right)=?$$

Accepted Answer

$$6x^2-3x-4x+2$$

Answer

$$5x^2-3x+4x-2$$

Answer

$$6x^2+2$$

Answer

$$x\cdot x$$

Question 8

$$\left(x+2\right)\left(2x+1\right)=?$$

Accepted Answer

$$2x^2+x+4x+2$$

Answer

$$2x^2+2$$

Answer

$$\left(2x\right)\cdot\left(3x\right)$$

Answer

$$4x+x$$

Question 9

$$\left(x-3\right)\left(x-4\right)=?$$

Accepted Answer

$$x^2-4x-3x+12$$

Answer

$$x^2-4x-3x-12$$

Answer

$$x^2+12$$

Answer

$$\left(-3x\right)\left(-4x\right)$$

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