Answer:
66 cm squared
Step-by-step explanation:
split the shape into 2 rectangles, then use the numbers given to solve for the new shapes
3cm by 7cm for one and 5cm by 9 cm for the other (there are multiple ways to split the shape)
multiply those numbers
3 x 7 = 21cm ^2
5 x 9 = 45cm ^2
add them together
66cm ^2 (squared)
Answer:c
X^2-x-12
FOIL
First, Outside, Inside, Last
First: X*X=X^2
Outside: x*-4=-4x
Inside: x*3=3x
Last:3*-4=-12
All together: X^2-4x+3x-12
Simplify: X^2-x-12
