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QUESTION FOR 50 POINTS Solve this equation using an algebraic method: (x + 4)(x - 4) = 9 Choices are: x=5 x=4 and x=-4 x=9 x=5 and x=-5
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Aug 3, 2018
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QUESTION FOR 50 POINTS
Solve this equation using an algebraic method: (x + 4)(x - 4) = 9
Choices are:
x=5
x=4 and x=-4
x=9
x=5 and x=-5
Mathematics
high-school
Toxalot
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the answer is
x=5 and x=-5
Eavidan
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Aug 5, 2018
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Eavidan
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(x+4)(x-4)=9 expand left side by performing indicated multiplication...
x^2-16=9 add 16 to both sides
x^2=25 take the square root of both sides...
x=±5
x=-5 and 5
So the answer would be the bottom choice.
JShorthouse
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Aug 8, 2018
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JShorthouse
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