Math 9 Midterm Review

 

I think the surface area and factoring are the most difficult concept for me.

question 1. solve the surface area of a 6cm cube

6(6×6) = 6(36) = 216. so the answer is 216 cm.

question 2. simplify (3x+ 4)(2x+3) and (x+6)(2x-4), and solve x²-7x+6.

(3x+ 4)(2x+3) = (3×2)x²+(3×3+2×4)x+3×4 = 6x²+(9+8)x+12 = 6x²+17x+12

(x+6)(2x-4) = (2×1)x²+(1×-4+6×2)x+6×-4 = 2x²+(12-4)x-24 = 2x²+8x-24

x²-7x+6 = (x-6)(x-1)

factoring

link: https://www.youtube.com/watch?v=eF6zYNzlZKQ

surface area (rectangular prism)

link: https://youtu.be/lm46kqCDWaI

Classroom equipments

fan

fan

cassette

cassette

filing-cabinet

filing cabinet

 

hole punch

hole punch

 

pencil sharpner

pencil sharpener

podium

podium

 

power bar

power bar

projector

projector

stereo

stereo

thermostat

thermostat

trolley

trolley

white board cleaner

white board cleaner