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OpenStudy (anonymous):
Find the x intercept of f(x)=4x^2-20
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OpenStudy (amistre64):
x int means y=0; this equals 0 when x = +-5 right?
OpenStudy (anonymous):
I think so
OpenStudy (amistre64):
how can we prove it?
OpenStudy (anonymous):
idk
OpenStudy (anonymous):
20 = 4x^2 5= x^2 x intercept is (square root of 5, 0)
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OpenStudy (amistre64):
is there a place in the equation to fit an x = -5 to see if this makes it equal zero?
OpenStudy (amistre64):
sqrt(5) yes lol... good call
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