SOLUTION: Linear & Quadratic Functions The zeros of a function f are the values of x for which f(x) = 0. In the problems, find (a) f(0); (b) the zeros of f f(x) = 3x - 9 f(x) = 5x - 8

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Linear & Quadratic Functions The zeros of a function f are the values of x for which f(x) = 0. In the problems, find (a) f(0); (b) the zeros of f f(x) = 3x - 9 f(x) = 5x - 8      Log On


   

Question 884093: Linear & Quadratic Functions
The zeros of a function f are the values of x for which f(x) = 0. In the problems, find (a) f(0); (b) the zeros of f
f(x) = 3x - 9
f(x) = 5x - 8
f(x) = x^2 - 8x + 15
f(x) = x^2 - 9x + 20
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
f%280%29+=+3%280%29+-+9=-9
+f%280%29+=+5%280%29+-+8-8
+f%280%29+=+%280%29%5E2+-+8%280%29+%2B+15=15
+f%280%29+=+%280%29%5E2+-+9%280%29+%2B+20=20
.
.
.
0+=+3x+-+9
3x=9
x=3
.
.
.
+0+=+5x+-+8
5x=8
x=8%2F5
.
.
.
+0+=+x%5E2+-+8x+%2B+15
%28x-3%29%28x-5%29=0
Two solutions:
x-3=0
x=3
and
x-5=0
x=5
.
.
.
0=x%5E2-9x%2B20
%28x-4%29%28x-5%29=0
Two solutions:
x-4=0
x=4
and
x-5=0
x=5