Substitution

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
2a² + c²   

• 22
• 34
• 68
• 43

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
3ab

• 10
• 12
• 15
• 36

Work out the value of the expression when x = 3, y = – 2 and z = – 4.
y + x – z     

• -5
• -3
• 3
• 5

Work out the value of the expression when x = 3, y = – 2 and z = – 4.
2x² + z²   

• 2
• 27
• 50
• 34

Work out the value of the expression when x = 3, y = – 2 and z = – 4.

• 1
• -1
• 1/5
• -6

Work out the value of the expression when a = 3, b = 4 and c = 5.

• 3
• 1   1/3
• 4
• 1/3

Work out the value of the expression when x = 3, y = – 2 and z = – 4.

• -3
• 4
• 3
• -4

• -50

• 6

• 4

• -55

• 128

• -124

• -34

• 35

• 19

• 20

• 4