SOLUTION: f(x) = −x^2 + 7x + 8 x = Find the x-intercepts of the graph of f. (x, y) = ___________ (smaller x-value) (x, y) = ___________ __(larger x-value)

Algebra ->  Inequalities -> SOLUTION: f(x) = −x^2 + 7x + 8 x = Find the x-intercepts of the graph of f. (x, y) = ___________ (smaller x-value) (x, y) = ___________ __(larger x-value)       Log On


   

Question 1131360: f(x) = −x^2 + 7x + 8
x =
Find the x-intercepts of the graph of f.
(x, y) = ____________(smaller x-value)
(x, y) = ______________(larger x-value)
Found 2 solutions by josgarithmetic, MathLover1:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
-x%5E2%2B7x%2B8=0
x%5E2-7x-8=0
%28x%2B1%29%28x-8%29=0
-1, and, 8; the x-intercepts.

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
f%28x%29+=+-x%5E2+%2B+7x+%2B+8
to find the x-intercepts of the graph of f, set f%28x%29+=y=0
0+=+-x%5E2+%2B+7x+%2B+8
x%5E2+-7x+-8=0
x%5E2+%2Bx-8x+-8=0
%28x%5E2+%2Bx%29-%288x+%2B8%29=0
x%28x+%2B1%29-8%28x+%2B1%29=0
%28x-8%29%28x+%2B1%29=0
=>x=8 and x=-1
(x, y) = _(-1, 0)__(smaller x-value)
(x, y) = _(8, 0)_(larger x-value)

+graph%28+600%2C+600%2C+-25%2C+25%2C+-25%2C+25%2C+-x%5E2+%2B+7x+%2B+8%29+