Question

describe and correct the error in evaluating the function g(x)= -5x+3 when x=-3

g(-3)= -5(-3)+3
-3g=18
g= -6

Answer 1

someone helpp

Answer 2

Ok I tried explaining this to someone the other day but I wasn't that clear in explaining it. Its hard to explain this concept online but let me try again

Answer 3

We are given the equation
g(x)= -5x+3
This is the equation of the function g and g varies according to the value of x
If g(x) was a constant such as g(x)=3 we would have a vertical line at y=3 but in our case our y keeps changing according to our x
So when x=2
y=-5(2)+3
y=-10+3
y=-7
Now when x=-3
y=-5(-3)+3
y=15+3
y=18

So basically as you can see our y-value keeps changing according to what our x equals
So g(-3) means what does g equal when our x equals -3

Answer 4

wait i write all that?????

Answer 5

nooo But do you understand what g(-3) means?

Answer 6

The error is that they multiplied g by -3 instead of treating it as "what does g equal when x=-3"
Then when x=-3
g(-3)=-5(-3)+3
g(-3)=15+3
g(-3)=18
So when x=-3 then g=18

Answer 7

g(x) is a function, so g(-3) means to evaluate g(x) using x = -3 as @swissgirl demonstrated.