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If (a-b=5) and (ab=6), what is (a^2+b^2)?

Answer and explanation

Correct answer: (37)

The square of a difference identity is (a-b)² = a² - 2ab + b². Rearranging it gives a²+b² = (a-b)² + 2ab. The given difference is 5, so its square is 25. The product ab is 6, so twice the product is 12. Adding these values gives 25 + 12 = 37. Therefore choice C is correct.

The plus sign before 2ab is essential because the negative middle term has already been moved to the other side. A common mistake is to report 25, which is only the square of the difference and omits the contribution of the product. Choice 37 includes both pieces required by the identity, so it is the complete value of a²+b².

Related tags

Quadratic ExpressionsIdentityValue Based

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