Find the value of a^3 + b^3, when a + b = 4 and ab = 3?
- 28
- 29
- 30
- None of these
Explanation
Given:
a + b = 4
ab = 3
The formula for a^3 + b^3 is:
a^3 + b^3 = (a + b)(a^2 - ab + b^2)
However, a simpler approach uses the identity:
a^3 + b^3 = (a + b)^3 - 3ab(a + b)
Plugging in the values:
a^3 + b^3 = (4)^3 - 3(3)(4)
= 64 - 36
= 28
Related MCQs
- 2x + 2
- 2x - 8
- 2x - 5
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 2x² + 4 = 9x
- 2x² + 9 = 4x
- 2x² + 9 = 4x
- x² + 4 = 9x
اس سوال کو وضاحت کے ساتھ پڑھیں
