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Write s² − 2s − 35 in factors.

Answer and explanation

Correct answer: (s − 7)(s + 5)

The direct answer is B: (s − 7)(s + 5). For an expression s² + bs + c, find two numbers whose product is c and whose sum is b. Here the product must be −35 and the sum must be −2. The numbers −7 and +5 satisfy both conditions: (−7)(5) = −35 and −7 + 5 = −2. Therefore s² − 2s − 35 = (s − 7)(s + 5). Expanding option A gives s² + 2s − 35, so its middle sign is wrong. Option C gives s² − 36s + 35. Option D gives s² + 34s − 35. The constant term being negative means the two numbers have opposite signs; their negative sum tells us that the negative number has the larger magnitude.

Related tags

QuadraticFactorisationSign ChoiceExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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