Algebra help?

Question

Please help me with these questions and please explain your answer

1. If g(x)=x^2 + 3x - 5 what is g(-2)?

2. Which of the following is a linear function? For those that are not identify the type of function they are.

A. g(x)= 2x^2- x+ 1
B. h(x)= Ix+1I
C. f(x)= 2x-5
D. g(x)= (-x^3) - 1
E. h(x)= squareroot of x-4

Answer 1

If g(x) = x^2 + 3*x - 5, and you're looking for g(-2), just plug (-2) in wherever you see an x...
g(-2) = (-2)^2 + 3*(-2) - 5 = 4 - 6 - 5 = -7

A is a quadratic function
B ...you know, sadly, i do not recall if the absolute value of a linear function is actually linear...it is for x>0 and x<0, but on the entire domain, it isn't linear, because it does not have a constant slope over the Reals...in fact, it doesn't have a defined slope at the origin...
C is linear
D is a cubic function
E is a function of degree 1/2, which is not linear (linear functions are always of degree 1)

Answer 2

1. g(-2)=(-2)^2+3(-2)-5=-7
2. A. Parabolic Function
B. Absolute Value Function
C. Linear Function
D. Not sure
E. Not sure

Answer 3

To do this, substitute -2 everywhere you have "x".
Then g(-2) = (-2*-2)+3(-2)-5= -6

2. B and C are linear functions. A is a quadratic, D is a cubic and E is an equation of half-order.

Answer 4

I cant read this, but a linear fxn does not have any numbers with exponents

Answer 5

1. -7
2. can you clarify in b is that L or 1?
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