Unit 9 Expressions and formulae review

Simplify this expression.
 $y^{10}\times y^4$  

•  $y^{14}$  

•  $y^{40}$  

•  $2y^{14}$  

•  $2y^{40}$  

Simplify this expression.
 $72y^{15}\div8y^6$  

•  $9y^9$  

•  $y^{21}$  

•  $9y^{21}$  

•  $y^9$  

Write an expression for the perimeter of this figure.

Write it in its simplest form.

• $2\left(8x-10\right)+3$

• $16x-14$

• $16x-26$

• $8x-7$

Write an expression for the area of this figure.
Write the expression in its simplest form.

•  $24x-30$ 

•  $24x+30$ 

•  $8x-7$ 

•  $8x-13$ 

Work out the value of this expression when  $x=-6,\ y=4\ and\ z=-1$  

 $\frac{2x^2+yz}{y}+16$  

• 33

• 34

• 35

• 36

Use the formula $P=2\left(l+b\right)$  to work out  $b$  when  $P=14\ and\ l=3$  

• 4

• 6

• 8

• 10

Use the formula $P=2\left(l+b\right)$  to work out  $P$  when  $l=-10\ and\ b=14$  

• 4

• 6

• 8

• 10

Factorise 

 $63m^2n+18m^3n$  

•  $9m^2n\left(7+2m\right)$  

•  $9m^2\left(7n+2mn\right)$  

•  $9m^3n\left(7m+2\right)$  

Factorise 

 $3xy-y$  

•  $3\left(xy+y\right)$  

•  $y\left(3x-1\right)$  

•  $y\left(3x-y\right)$  

Expand and simplify 

 $\left(x+4\right)\left(x-11\right)$  

•  $x^2+7x-44$  

•  $x^2-7x-44$  

•  $x^2-15-44$