NZ Level 6 (NZC) Level 1 (NCEA)
Expand difference of two squares

## Interactive practice questions

Which of the expressions below is equivalent to $\left(a+b\right)\left(a-b\right)$(a+b)(ab)?

$a^2-b^2$a2b2

A

$a^2+b^2$a2+b2

B

$a^2+2ab+b^2$a2+2ab+b2

C

$a^2-2ab+b^2$a22ab+b2

D

$a^2-b^2$a2b2

A

$a^2+b^2$a2+b2

B

$a^2+2ab+b^2$a2+2ab+b2

C

$a^2-2ab+b^2$a22ab+b2

D
Easy
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Expand the following:

$\left(m+3\right)\left(m-3\right)$(m+3)(m3)

Expand the following:

$\left(x-7\right)\left(x+7\right)$(x7)(x+7)

Expand the following:

$\left(v+\frac{1}{7}\right)\left(v-\frac{1}{7}\right)$(v+17)(v17)

### Outcomes

#### NA6-5

Form and solve linear equations and inequations, quadratic and simple exponential equations, and simultaneous equations with two unknowns

#### 91027

Apply algebraic procedures in solving problems