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which expression is equivalent to x^2-4? (x-2)^2 (x-2)(x+2) (x+2)(x+2) x^2(-4)

(x-2)(x+2) because the x values cancel out leaving the integer and x^2 value.
BS
Answered by Bronte S. • Maths tutor
4724 Views

A cuboid has a rectangular cross section where the length of the rectangle is equal to twice its width x cm. THe volume is 81 cm^3. a) show that the total length L cm of the cuboid is given by L=12x+162/x^2

Volume=81 cm 3 b=81/2x 2 L=4x+4(2x)+ 4(b) L=4(x)+4(2x)+4(81/2x 2 ) L=12x+ 162/x 2
BT
Answered by Bilaal T. • Maths tutor
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How to make something the subject of the formula?

Make a the subject of the formula from : p = (3a + 5)/(4 - a) When doing questions like these it is best to remember that if you multiply one side of the equation you have to do the same thing on the other s...
RC
Answered by Robin C. • Maths tutor
5763 Views

Outline and explain two reasons for gender differences in educational achievement.

Due to society's views on gender, male children are often given a lot more freedom than female children. For example, boys are encouraged to take up traditionally masculine activities like sports, while girl...
MM
39545 Views

An unknown compound burns with a lilac flame and produces a yellow precipitate when mixed with dilute nitric acid and silver nitrate. Give the formula of the compound.

(Talk about needing to memorise colour tests for base metals and tests for Halides) The compound is KI (potassium Iodide) because potassium compounds burn with a lilac flame, and production a pale yellow pre...
MH
Answered by Matthew H. • Chemistry tutor
14147 Views