Cho f(x)=ax^2 +bx+0 . A) tính f(1) , f(3). B) biết 5a -b+2c=0.Chứng minh f(1),f(2) bé hơn hoặc bằng 0

add 5 subtract 1

step-by-step explanation:

angle addition postulate

2x=56

step-by-step explanation:

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.