Equations and Expression

Question 1

Work out x
4x-9=41

Answer 1

x=8

Question 2

Work out a, if b=3
2ab=306

Answer 2

a=51

Question 3

Work out z
2z+8=5z-4

Answer 3

z=4

Question 4

Simplify the expression
-6(2a-5)+7a+92

Answer 4

-5a+122

Question 5

Simplify this expression
7k-69+412-56k+10k+35-209

Answer 5

-39z+169

Question 6

Work out z
4(z+1.5)=50

Answer 6

z=11

Question 7

Work out d
6d²-7=89

Answer 7

d=4 or -4

Question 8

Work out j
j²=j+12

Answer 8

j=4

Question 9

Work out y
8y-12=3(y+1)

Answer 9

y=3

Question 10

Is this an expression or equation?
4t+f=23

Answer 10

Equation

Question 11

Is this an expression or equation?
856<3g-1057

Answer 11

Equation

Question 12

Is this an expression or equation?
5r(r+f)x3r+6

Answer 12

Expression

Question 13

Work out m
8m²/2=18²

Answer 13

m=9 or -9

Question 14

Work out t
13(t+(41-72)=663

Answer 14

t=82

Question 15

Work out p
256-6p=108

Answer 15

p=25

Question 16

Work out g
465+7g-391=123

Answer 16

g=7

Question 17

Simplify this equation
-d(d²+8)-9(3+6d)

Answer 17

-y³-62y-27

Question 18

Work out r
6r³=48

Answer 18

r=2

Question 19

Work out s
(s+9)²=256

Answer 19

7 or -25

Question 20

Work out x
(x-1)²=100

Answer 20

-9 or 11

Question 21

Patrick think of a number.

She finds the square root and then adds 10.
Her answer is 35.

What number is she thinking of?

Answer 21

625

Question 22

Jack thinks of a number.

He divides by 8 and then multiply by 5.
His answer was 45.

What is the number is she thinking of?

Answer 22

72

Question 23

Joanna thinks of a number.

He multiplies it by -7 and then subtracts 5.
His answer is 51

What is the number he thinking of?

Answer 23

-8

Question 24

Matilda and Oscar think of the same number.

Matilda divides her number by 7 and then adds 3.
Her answer is 6.

Oscar subtracts 9 then squares.
His final answer is z

Work out Oscar final answer,z.

Answer 24

z=144

Question 25

Elena and George think of the same number.

Elena multiples her number by 2 and then adds 4.
Her answer is 18.

Oscar cubes then subtracts 19.
After that, he finds the square root.
His final answer is y.

Work out George final answer,y.

Answer 25

y=18