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Use property to evaluate: 38^(3) + (-2...

Use property to evaluate:
`38^(3) + (-26)^(3) + (-12)^(3)`

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To evaluate the expression \( 38^3 + (-26)^3 + (-12)^3 \) using properties of cubes, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the values:** Let \( A = 38 \), \( B = -26 \), and \( C = -12 \). 2. **Calculate \( A + B + C \):** \[ A + B + C = 38 + (-26) + (-12) = 38 - 26 - 12 = 38 - 38 = 0 \] 3. **Apply the property of cubes:** Since \( A + B + C = 0 \), we can use the identity: \[ A^3 + B^3 + C^3 = 3ABC \] 4. **Calculate \( ABC \):** \[ ABC = 38 \times (-26) \times (-12) \] First, calculate \( (-26) \times (-12) \): \[ (-26) \times (-12) = 312 \] Now, calculate \( 38 \times 312 \): \[ 38 \times 312 = 38 \times (300 + 12) = 38 \times 300 + 38 \times 12 \] \[ 38 \times 300 = 11400 \] \[ 38 \times 12 = 456 \] \[ 38 \times 312 = 11400 + 456 = 11856 \] 5. **Calculate \( 3ABC \):** \[ 3ABC = 3 \times 11856 = 35568 \] 6. **Final Result:** Therefore, \[ 38^3 + (-26)^3 + (-12)^3 = 35568 \]
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ICSE-EXPANSIONS-Exercise 4(B)
  1. If a + 2b + c= 0, then show that: a^(3) + 8b^(3) + c^(3)= 6abc

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  2. Use property to evaluate: 13^(3) + (-8)^(3) + (-5)^(3)

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  3. Use property to evaluate: 7^(3) + 3^(3) + (-10)^(3)

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  4. Use property to evaluate: 9^(3) -5^(3) - 4^(3)

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  5. Use property to evaluate: 38^(3) + (-26)^(3) + (-12)^(3)

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  6. If a ne 0 and a - (1)/(a)= 3, find : a^(2) + (1)/(a^(2))

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  7. If a ne 0 and a - (1)/(a)= 3, find : a^(3)- (1)/(a^(3))

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  8. If a ne 0 and a - (1)/(a)= 4, find a^(2) + (1)/(a^(2))

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  9. If a ne 0 and a - (1)/(a)= 4, find a^(4) + (1)/(a^(4))

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  10. If a ne 0 and a - (1)/(a)= 4, find a^(3)- (1)/(a^(3))

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  11. If x ne 0 and x + (1)/(x) = 2, then show that: x^(2)+ (1)/(x^(2))= x^(...

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  12. If 2x- 3y= 10 and xy= 16, find the value of 8x^(3)- 27y^(3)

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  13. Expand: (3x+ 5y+ 2z) (3x- 5y + 2z)

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  14. Expand: (3x- 5y - 2z) (3x- 5y + 2z)

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  15. The sum of two numbers is 9 and their product is 20. Find the sum of t...

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  16. The sum of two numbers is 9 and their product is 20. Find the sum of t...

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  17. Two positive numbers x and y are such that x gt y. If the difference o...

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  18. Two positive numbers x and y are such that x gt y. If the difference o...

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  19. Two positive numbers x and y are such that x gt y. If the difference o...

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  20. If 4x^(2) + y^(2)=a and xy= b, find the value of 2x+y

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