f(x) = a*( x - 7)*( x + 1)
q = - 4
----------------
Miejsca zerowe:
x1 = - 1 ; x2 = 7
zatem p = [ x1 + x2]/2 = [ -1 + 7 ] /2 = 6/2 = 3
f(p) = q
czyli
a*( 3 - 7)*( 3 + 1) = - 4
a*(-4)*4 = - 4
a = 1/4
========
Mamy więc
f(x) = (1/4) *( x - 7)*(x + 1)
f(x) = (1/4)*(x^2 - 6 x - 7) = (1/4)x^2 - (6/4) x - 7/4
Odp. f(x) = (1/4) x^2 - (3/2) x - 7/4
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f(x) = a*( x - 7)*( x + 1)
q = - 4
----------------
Miejsca zerowe:
x1 = - 1 ; x2 = 7
zatem p = [ x1 + x2]/2 = [ -1 + 7 ] /2 = 6/2 = 3
f(p) = q
czyli
a*( 3 - 7)*( 3 + 1) = - 4
a*(-4)*4 = - 4
a = 1/4
========
Mamy więc
f(x) = (1/4) *( x - 7)*(x + 1)
czyli
f(x) = (1/4)*(x^2 - 6 x - 7) = (1/4)x^2 - (6/4) x - 7/4
Odp. f(x) = (1/4) x^2 - (3/2) x - 7/4
=======================================