solving equations 1 - solve my maths · pdf file · 2016-02-01microsoft word -...
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Easy (ish)
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Medium (ish)
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Hard
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SolvingEQUATIONS
1.0 Brackets
You should have worked through inverse operations before you attempt this sheet!
Solve for n:
1. 3(n+2) = 12 2. 2(n + 8) = 56 3. 5(n + 2) = 100 4. 10(n + 3) = 280 5. 3(2n + 2) = 0
6. 2(3n-‐3) = 36 7. 5(2n-‐5) = 26 8. 8(n-‐9) = 80 9. 12(0.5n+ 2) =36 10. n(3+7) + 2 = 92
11. 2(n – 4) = 3(n+4) 12. 4(2n-‐a+5) = 5 13. 7(5-‐n) = 2(a+3) 14. 2(a+b) = 9n 15. 1/n(2+a) = 8
1.1 Squares and Other Indices
Solve for n (or rearrange for q11-‐q15):
1. 𝑛! = 81 2. 𝑛! = 121 3. 𝑛! = 36 4. 𝑛! = 27 5. 𝑛! = 125
6. 𝑛! + 6 = 150 7. 𝑛! − 10 = 6 8. 𝑛! − 8 = 41 9. 𝑛! + 9 = 73 10. 12− 𝑛! = −88
11. 𝑛! − 𝑎 = 𝑐 12. 𝑝! − 𝑛! = 0 13. 𝑡𝑛! = 4𝑤 14. 𝑡!𝑛! = 10 15.
!!!= 𝑘
1.2 Combinations (Brackets and Indices)
Solve for n (or rearrange for q11-‐q14):
1. 𝑛! = 13(9 + 4) 2. 𝑛! = 5(40 + 5) 3. 2(𝑛! + 2) = 292 4. 2(𝑛! + 1) = 34 5. 2(𝑛! − 4) = 64
6. 𝑛! = 6(6 + 18) 7. 𝑛(𝑛 + 2𝑛) = 48 8. 𝑛(𝑛!) = 27 9. 𝑛! = 5(18+7)
10. −2(𝑛! + 4) = −40
11. 𝑛! = a(b-‐c) 12. 𝑛! = 7c(a+2b) 13. 𝑛! = 3(a-‐2c) 14. 𝑛!(𝑛!) = p 15. 𝑛 = 4( 2)
Answers 1. n = 2 2. n = 20 3. n = 18 4. n = 25 5. n = -‐1 6. n = 7 7. n = 5.1 8. n = 19 9. n = 2 10. n = 9 11. n = -‐20 12. n = 6.25 + a 13. n = (32-‐2a)/7 14. n = (2(a+b))/9 15. n = (2+a)/8
1. n=+-‐9 2. n=+-‐11 3. n=+-‐6 4. n=3 5. n=5 6. n=+-‐12 7. n=+-‐4 8. n=+-‐7 9. n=4 10. n=+-‐10 11. 𝑛 = ± 𝑐 + 𝑎 12. n=+-‐p
13. 𝑛 = ± !!!
14. 𝑛 = ± !"!!
15. 𝑛 = !!
!
1. n=8 2. n=+-‐15 3. n=+-‐12 4. n=+-‐4 5. n=+-‐6 6. n=+-‐12 7. n=+-‐4 8. n=3 9. n=5 10. n=+-‐4 11. 𝑛 = 𝑎(𝑏 − 𝑐)! 12. 𝑛 = 7𝑐(𝑎 + 2𝑏)! 13. 𝑛 = 3(𝑎 − 2𝑐)! 14. 𝑛 = 𝑝! 15. n=8