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September 23, 2014

September 23, 2014

Posted by **Shawna** on Thursday, March 20, 2014 at 12:58pm.

f(x)=x^2+2x−5

A) 1

B) 2

C) 3

D) 4

E) 6

f(2)=2^2+2(2)-5

f(2)=3

so is it c?

- Math - PreCalc (12th Grade) -
**Steve**, Thursday, March 20, 2014 at 1:21pmok so far, though they already told you that f(2)=3 because the point (2,3) is on the graph.

As you know, the slope at any point (x,y) on the graph is 2x+2

So, the slope at x=2 is 6

Though, if this is pre-calc, how do you know the slope of the tangent to a curve? That's actual calculus.

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