Question

A parabola has roots at 0.4 and -3. The equation is f(x) = 6-ax-bx². Find the value of b.

Answer 1

product of roots =constant/coeff. of x^2
so,
0.4*-3=-1.2=6/-b
b=6/1.2=5
:)

Answer 2

Wut? How come the product of roots = constant/coefficient of x² ?

Answer 3

@Aperogalics

Answer 4

@geerky42 can u answer my simple answers?????????

Answer 5

What do you mean?

Answer 6

i mean to say that give me answers of some simple questions related to this and u will get to know the answer.............r u ready?????????

Answer 7

Sure.

Answer 8

ok
0.4 and -3 are roots so (x-0.4) and (x-(-3)) are factors.....right

Answer 9

Yeah, (x-0.4)(x+3) = f(x)

f(x) is also equal to 6-ax-bx², right?

Answer 10

yup:)
now see this