f(x) = -2x² - x + 36
a) f(2) = -2*2² - 2 + 36
f(2) = -8 - 2 + 36
f(2) = 26
b) f(x) = 0
-2x² - x + 36 = 0
D = (-1)² - 4*(-2)*36 = 1+288 = 289 = 17²
x1 = 1+17/2*(-2) ; x1 = 18/-4 ; x1 = -4.5
x2 = 1-17/2*(-2) ; x2 = -16/-4 ; x2 = 4
Нули функции : -4.5 ; 4
Объяснение:
f(x) = -2x² - x + 36
a) f(2) = -2*2² - 2 + 36
f(2) = -8 - 2 + 36
f(2) = 26
b) f(x) = 0
-2x² - x + 36 = 0
D = (-1)² - 4*(-2)*36 = 1+288 = 289 = 17²
x1 = 1+17/2*(-2) ; x1 = 18/-4 ; x1 = -4.5
x2 = 1-17/2*(-2) ; x2 = -16/-4 ; x2 = 4
Нули функции : -4.5 ; 4
Объяснение: