SOLUTION: Consider the function f(x)=2x^2-8 and g(x)=-8/x+2 a)write down the y-intercept of f

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Question 1036398: Consider the function f(x)=2x^2-8 and g(x)=-8/x+2
a)write down the y-intercept of f
Found 2 solutions by josgarithmetic, macston:
Answer by josgarithmetic(39618) About Me  (Show Source):
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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The y-intercept of f(x) is where f(x)=0:
f%28x%29=2x%5E2-8
y=2x%5E2-8
0=2x%5E2-8
8=2x%5E2
4=x%5E2
2=x
x=2 or x=-2
.
+graph%28+500%2C+500%2C+-10%2C+10%2C+-10%2C+10%2C+2x%5E2-8%29+
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y-intercept is where x=0:
.
y=2x%5E2-8
y=2%280%5E2%29-8
y=-8