Math 8 · Unit 1: Integers · Cambridge Lower Secondary Maths Stage 8

Questions

1. 1. Work out 14²

   • 28
   • 196
   • −196
   • 144
   Check

2. 2. Work out (−14)²

   • −196
   • −28
   • 28
   • 196
   Check

3. 3. Work out (−20)²

   • 40
   • 400
   • −40
   • −400
   Check

4. 4. Work out (−30)²

   • −60
   • 900
   • −900
   • 60
   Check

5. 5. Work out 4³

   • 12
   • 256
   • 64
   • 16
   Check

6. 6. Work out (−6)³

   • 36
   • 216
   • −18
   • −216
   Check

7. 7. Work out (−10)³

   • −100
   • −1000
   • −30
   • 1000
   Check

8. 8. Work out (−1)² + (−1)³

   • 0
   • 1
   • 2
   • −2
   Check

9. 9. If possible, work out √−64

   • 32
   • −8
   • Not possible
   • 8
   Check

10. 10. If possible, work out ∛−64

    • 4
    • −16
    • −4
    • −8
    Check

11. 11. ∛(−125) = ?

    • −5
    • −41.7
    • 5
    • −25
    Check

12. 12. If possible, work out ∛−729

    • −9
    • −243
    • −27
    • 9
    Check

13. 13. Solve the equation x² = 25

    • x = 12.5
    • x = −5
    • x = 5
    • x = 5 or x = −5
    Check

14. 14. Solve the equation x² = 225

    • x = 25 or x = −25
    • x = −15
    • x = 15 or x = −15
    • x = 15
    Check

15. 15. Solve the equation x² − 81 = 0

    • x = 9 or x = −9
    • x = −9
    • x = 9
    • x = 81 or x = −81
    Check

16. 16. Solve the equation x² + 121 = 0

    • x = −11
    • x = 11 or x = −11
    • No solution
    • x = 11
    Check

17. 17. Solve the equation x³ = 216

    • x = −6
    • x = 72
    • x = 6 or x = −6
    • x = 6
    Check

18. 18. Solve the equation x³ = −216

    • x = −72
    • x = 6
    • x = 6 or x = −6
    • x = −6
    Check

19. 19. Solve the equation x³ + 1000 = 0

    • x = 10
    • x = −10
    • x = −100
    • x = 10 or x = −10
    Check

20. 20. Solve the equation x³ + 8000 = 0

    • x = −40
    • x = −20
    • x = 20
    • x = 20 or x = −20
    Check