Year 9 - Expressions and Formulae Review

Using the formula

 $s=ut+\frac{1}{2}at^2,$  find s when u=15, a=2.5 and t=20.

•  $800$  

•  $500$  

•  $300$  

•  $100$  

 $\frac{2y}{3}-\frac{y}{4}$  

•  $\frac{11y}{12}$  

•  $\frac{5y}{12}$  

•  $\frac{y}{12}$  

•  $\frac{12}{y}$  

 $\frac{5}{x}+\frac{1}{2x}$  

•  $\frac{10}{2x}$  

•  $\frac{11}{2x}$  

•  $\frac{6}{x^2}$  

•  $\frac{5x+1}{2x^2}$  

 $\left(x+2\right)\left(x-6\right)$  

•  $x^2-8x-12$  

•  $x^2-4x+12$  

•  $x^2-4x-12$  

•  $x^2-12$  

 $\left(x+5\right)^2$  

•  $x^2-10x+25$  

•  $x^2+5x+25$  

•  $x^2+25$  

•  $x^2+10x+25$  

Make x the subject of equation:

 $y^2=x^2+c^2$  

•  $\sqrt{y^2-c^2}$  

•  $\sqrt{y^2+c^2}$  

•  $y^2-c^2$  

•  $y^2+c^2$  

The width of a rectangle is w cm. Its length is 4 cm more than its width. If the perimeter of the rectangle is 28 cm, find its length and width.

• $11\ and\ 7$

• $8\ and\ 8$

• $9\ and\ 5$

• $7\ and\ 3$

 $20x+15y=$  

•  $3\left(20x+5y\right)$  

•  $5\left(5x+5y\right)$  

•  $5\left(4x+15y\right)$  

•  $5\left(4x+3y\right)$  

 $4xy-x^2=$  

•  $x\left(4y-x\right)$  

•  $x\left(4y+x\right)$  

•  $y\left(4x-y\right)$  

•  $x\left(4y-2x\right)$  

 $Expand:\ 3x\left(1+2y\right)-2y\left(1-2x\right)$  

•  $3x+2xy-2y$  

•  $3x+10xy-2y$  

•  $3x+10xy+2y$  

•  $3x-10xy-2y$