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13-03-2018
Mathematics

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what is the intersection points of f(x)=2x+7 and g(x)=x^2-1

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tynollette tynollette

13-03-2018

intersecting means f(x)=g(x)
2x+7=x²-1
x²-2x-8=0
(x-4)(x+2)=0
x=4, or x=-2
when x=4, f(x)=g(x)=15
when x=-2, f(x)=g(x)=3
so the intersecting points are (4, 15) and (-2, 3)

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