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If (p(x)=x²−8x+10), what are its zeroes?

Answer and explanation

Correct answer: (4+√6) and (4−√6)

The governing concept is finding the zeroes of a quadratic polynomial by solving p(x)=0 with the quadratic formula. Set x²−8x+10=0, where a=1, b=−8, and c=10. Then x=[−b±√(b²−4ac)]/(2a)=[8±√(64−40)]/2=[8±√24]/2. Since √24=√(4×6)=2√6, the roots become [8±2√6]/2=4±√6. Thus the zeroes are 4+√6 and 4−√6, so option A is correct. Option B uses an incorrect discriminant and fails to divide correctly. Option C has the wrong half of the constant term, while option D replaces √6 with √10 without justification. Substitution into the polynomial also verifies both roots.

Related tags

PolynomialsQuadratic-FormulaZeroesPolynomials In One VariableMathematicsClass 10 Mcq

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