3
Year 8 math Name: 1h2 Working with Terms date: 1 A. Evaluate the following expressions by substituting the indicated values for each variable: 1. a + b ( ) 2 a b ( ) , if a = 2, b = 1 2. 1 ÷ 3 r ( ) , if r = -3 3. m + n ( ) m n ( ) 3 if m = 1, n= 2 4. 5 x 2 x + 3 , if x = -2 5. p 2 q 2 + t 2 , if p = 1, q = -1, t = 1 2 6. 15 b 3 ( )ib , if b = 5 7. y 2 5 y , if y = 0.5 8. 4t 3 3 t 2 + t + 2 , if t = -0.5 9. a 3 3a 2 4 , if a = -3 10. 2b 2 + b , if b = 4 B. Simplify the following by adding/subtracting and collecting like terms: Be careful with your variables… remember: x + x = 2 x & x 2 + x 2 = 2 x 2 but , x x = x 2 & x 2 x 2 = x 4 1. 14 + 4 r ( ) + 10r + 7 ( ) 2. 14 x 2 + 13x ( ) 6 x + 12 ( ) 3. 5 k 8 k 2 ( ) + k + 4 k 2 ( ) 4. v + 11 v 3 ( ) −−14 v 3 14 v ( ) 5. 14 a 3 b 3 + 5ab 3 ( ) 5b 3 4 a 3 b 3 14 ab 3 ( ) + 9ab 3 4b 3 ( ) 6. 6a 2 + 14 a 3 b 2 ( ) + 5a 3 b 2 + 6a 2 9a 3 ( ) + 2a 3 + 2a 2 ( ) 7. 10a 2 b 2 + 10a 3 b 3 ( ) 12a 3 b 3 + a 2 b 2 + 3a 3 ( ) 14 a 3 + 3a 2 b 2 ( ) 8. 8 xy 3 + 2 xy ( ) + 14 x 2 y 3 + 11x 3 3xy 3 ( ) 9 xy 3 + 3x 2 y 3 ( ) 9. 17 6 x 3 + 19 5 x 4 + 7 x 3 3 + 8 x 4 10. 24 5 9 7 n 7 6 n 12 5

Year 8 math Namelv2learnmath.weebly.com/uploads/8/4/0/7/8407635/1h2...Year 8 math Name: 1h2 Working with Terms date: 1 A. Evaluate the following expressions by substituting the indicated

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Page 1: Year 8 math Namelv2learnmath.weebly.com/uploads/8/4/0/7/8407635/1h2...Year 8 math Name: 1h2 Working with Terms date: 1 A. Evaluate the following expressions by substituting the indicated

Year 8 math Name: 1h2 Working with Terms date:

1

A. Evaluate the following expressions by substituting the indicated values for each variable: 1. a + b( )2 a − b( ) , if a = 2, b = 1 2. 1÷ 3− r( ) , if r = -3 3. m + n( ) m − n( )3 if m = 1, n= 2 4. 5x2 − x + 3 , if x = -2

5. p2 − q2 + t 2 , if p = 1, q = -1, t = 12

6. 15 − b − 3( )ib , if b = 5

7. −y2 − 5y , if y = 0.5 8. 4t 3 − 3t 2 + t + 2 , if t = -0.5 9. a3 − 3a2 − 4 , if a = -3 10. −2b2 + b , if b = 4 B. Simplify the following by adding/subtracting and collecting like terms: Be careful with your variables… remember: x + x = 2x & x2 + x2 = 2x2 but, x ⋅ x = x2 & x2 ⋅ x2 = x4

1. 14 + 4r( ) + −10r + 7( ) 2. −14x2 +13x( ) − 6x +12( ) 3. 5k − 8k2( ) + −k + 4k2( ) 4. v +11v3( ) − −14v3 −14v( ) 5. 14a3b3 + 5ab3( ) − 5b3 − 4a3b3 −14ab3( ) + 9ab3 − 4b3( ) 6. 6a2 +14a3b2( ) + 5a3b2 + 6a2 9a3( ) + 2a3 + 2a2( ) 7. 10a2b2 +10a3b3( ) − 12a3b3 + a2b2 + 3a3( ) − 14a3 + 3a2b2( ) 8. 8xy3 + 2xy( ) + 14x2y3 +11x3 − 3xy3( ) − 9xy3 + 3x2y3( ) 9. −

176x3 + 19

5x4⎛

⎝⎜⎞⎠⎟+7x3

3+ 8x4

⎛⎝⎜

⎞⎠⎟ 10.

245

−97n⎛

⎝⎜⎞⎠⎟−76n − 12

5⎛⎝⎜

⎞⎠⎟

Page 2: Year 8 math Namelv2learnmath.weebly.com/uploads/8/4/0/7/8407635/1h2...Year 8 math Name: 1h2 Working with Terms date: 1 A. Evaluate the following expressions by substituting the indicated

Year 8 math Name: 1h2 Working with Terms date:

2

C. Expand and simplify:

1. 4 x2 −1( )− 2x2 − 3x( ) + 7x2 + 6x( )

2. 5x3 − 2x − 3( ) + 6x3 + x2 + x( ) + 4x2 + 3( )

3. 16x2 − 5x − 2( )− −5x2 + 8x − 7( ) 4. x2 − 4( ) + −x + 2( ) 5. y − 5( )− 6y + 4( ) + 7y − 6( ) 6. −5y + 2a( ) + 5 −2y − a( ) 7. y 8y2 − 2y +1( )− 9y3 − 5y − 6( ) D. Simplify:

Expand using distribution and simplify E. F. G.

Page 3: Year 8 math Namelv2learnmath.weebly.com/uploads/8/4/0/7/8407635/1h2...Year 8 math Name: 1h2 Working with Terms date: 1 A. Evaluate the following expressions by substituting the indicated

Year 8 math Name: 1h2 Working with Terms date:

3

Answers A.

1) 9 2) 16

3) -3 4) 25 5) 0.25

6) 5 7) -2.75 8) 0.25 9)-58 10) -2 B. 1) – 6r +21 2) −14x2 + 7x −12 3) −4k2 + 4k 4)25v3 +15v 5) 18a3b3 + 28ab3 − 9b3 6) 19a3b2 +11a3 +14a2 7) −2a3b3 + 6a2b2 −17a3 8) 11x2y3 − 4xy3 +11x3 + 2xy

9) 595x4 − 1

2x3 10) −

10342

n + 365

C. 1. 9x2 + 9x − 4 2. 11x3 + 5x2 − x 3. 21x2 −13x + 5 4. x2 − x − 2 5. 2y −15 6. −15y − 3a 7. −y3 − 2y2 + 6y + 6

D.

1. −218n 2.

398m− 17

16 3.

85r 4.

12x 5. −

52x + 20

3

6. 595n − 3

5 7.

74a − 9

20 8. −  3

2k − 17

15

E. F. G. 2. xy + xz 3. x2 − 3x −10 4. −6x3 + 21x2 − 9x −15

4. 16 5. x2 − 25 6. 6a3 − 7a2 − 2a + 24 6. x4 − 3x3 − 5x2 7. x4 + x2 − 30 8. 2y4 − 2y3 − 35y2 + 2y +15

8. 5x −15y 9. 6x2 − x − 2

10. −2x3 − 2x2 +10x 11. x2 − 20x + 75 12. 8y + 72

14. 3x3y4 − 5x3y3 + 3x2y4 16. 0.24x3 − 0.6x 18. 6a3b − 30ab4