Algebraic Formulae

In which of the following, is E the subject of the formula?

• E = L ⁄ 5E
• 2E = bh
• E = mc²
• E² = u² + 2as

The area, A of trapezium ABCD is given by the formula A = ½ h (a + b).
Which of the following is true?

• h is the length of AB
• h is the length of DC
• a is the length of AB
• b is the length of DC

A rectangle is r cm long, s cm wide and has an area of P cm². Express P in terms of r and s.

• P = rs
• P = r ∕ s
• P = 2rs
• P = (rs)²

Given that x = 5 and y = ½, hence 3x² − 2xy =

• 25
• 55 
• 70
• 85

Find the value of 7j - 12 when j = 2.

• 2

• -2

• 5

• -5

Given T = 4k.

Make k as the subject.

• T/4

• 4T

• 4+T

• T - 4

p = r + 8.

Express r in terms of p.

• p - 8

• 8 - p

• p + 8

p = 2m - n

Express m in terms of n.

• (p + n)/2

• (p - n)/2

• (n - p)/2

• 2(p + n)

8/x = y

Make x as the subject.

• 8/y

• 8y

• 8 - y

• 8 + y

Given √a = 8b - 5c.

Calculate a when b = 2 and c = 3.

• 1

• 2

• 3

• 4