Evaluate: (23 – 15) + 4 - Mathematics

Evaluate:

(23 – 15) + 4

Sum

(23 – 15) + 4 = 8 + 4 = 12

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Concept of Substitution

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Chapter 20: Substitution (Including Use of Brackets as Grouping Symbols) - Exercise 20 (B)

Chapter 20 Substitution (Including Use of Brackets as Grouping Symbols)
Exercise 20 (B) | Q 1.1

Fill in the blank, when:
x = 3, y = 6, z = 18, a = 2, b = 8, c = 32 and d = 0.

c ÷ b = ...........

If a = 3, b = 0, c = 2 and d = 1, find the value of 3a + 2b − 6c + 4d

Show that the value of x³ – 8x² + 12x – 5 is zero, when x = 1.

If a = 3, find the values of a² and 2^a.

Simplify:

− m − n − (− m) − m

Fill in the blank:

3x − z + y = 3x − (..............)

Insert the bracket as indicated:

m + n − p = − (.............)

Insert the bracket as indicated:

a + 4b − 4c = a + (...............)

If x = 3, y = 2 and z = 1; find the value of 3x² − 5y²

Simplify:

3x – 6 {3x – 8 (5x – 10)}