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What are the zeros of the quadratic function f(x)=8^2-16-15
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What are the zeros of the quadratic function f(x)=8^2-16-15

What are the zeros of the quadratic function f(x)=8^2-16-15-example-1
User Verri
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13 votes
13 votes

Answer:

C)

Explanation:

f(x)=
8x^(2) -16x-15

8x^(2) -16x-15=0

x=\frac{-b+-\sqrt{b^(2)-4ac } }{2a} , a=8, b= - 16, c= - 15


x=(-(-16)+-√((-16)^2-4*8*(-15)) )/(2*8) = (16+-√(736) )/(16) =(16+-4√(46) )/(16) = 1 +- (√(46) )/(4) = 1+- (√(23) √(2))/(2√(2) √(2) ) =1+-(√(23) )/(2√(2) ) = 1+-(√(23) )/(√(8) )

User Ton Plomp
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