Checking and securing understanding of factorising | Maths

Starter quiz

A bakery sells $x$ cakes for £2.25 each. If the cost to make each cake is £1.20, what is the profit, $p$ , for selling all the cakes?
- $p = 1.2x$
- $p = (2.25-1.2)x$ ✓
- $p = 2.25x - 1.2$
What is the value of $x$ in $2x + 3 = 15$
- '6' ✓
Simplify $3ax + 9ax + 13ax + b$
- '25ax + b' ✓
Expand $2(x - 3) + 4(2x + 1)$ and simplify where possible.
- '10x - 2' ✓
Simplify $3(x + 2)^2 - (x - 1)(x + 1)$ where possible.
- $2x^2 + 12x + 13$ ✓
- $3x^2 + 12x + 7$
- $4x^2 + 12x + 7$
Factorise $4x^2 - 16$ completely.
- $(2x + 4)(2x - 4)$
- $(2x)^2 - 4^2$
- $4(x-2)(x+2)$ ✓