Question

Please help me. I suck at math >.<

Find the zeros of f(x) = x2 - 9

Find the zeros of the function h(x) = 3x2 + 13x + 4

Find the zeros of the function g(x) = x2 - 6x - 16

Find the zeros of f(x) = x2 + 4x - 5

Answer 1

equate f(x) , g(x) , h(x) to zero and find

Answer 2

for example i'll solve first one for u......

x^2 - 9=0
X^2=9
x=9^(1/2)
x= +3, -3

Answer 3

But could you explain it to me? I dont really get it.

Answer 4

first we hv x^2 = 9

Get it???

Answer 5

yeah

Answer 6

Then take square root on both sides

Get it??

Answer 7

okay

Answer 8

so sqaure root of x^2 is x and square root of 9 are +3 and -3

Now???

Answer 9

Yeah okay thank you!
Okay, so can you explain the second one?
Theres an extra step in that one. right?

Answer 10

ya in that one u got2 create factors

do u know the method of splitting the middle term????

Answer 11

eh, I don't really get it.

Answer 12

see u got2 split the middle term i.e. 13x into two terms so that sum of the terms is 13x and product is 3*4=12

compare the given equation with std. one 3x^2 + 13x + 4 (ax^2 + bx + c)

so b= m + n and a*c=m*n

Did u get it???

Answer 13

Yeah I get that

Answer 14

so will u try it by urself now????

Answer 15

coz the rest 2 r also of same type

Answer 16

tell will u try or shall i wait???

Answer 17

Yeah ill try, thank you for the help!(:

Answer 18

ur welcum

Answer 19

Just in case you're going about this blindly, "finding zeroes" means finding all the points on the function that lie somewhere along the x-axis aka at some x-value with y = 0.

You could also use the quadratic formula if you want to remove the thinking and just keep this "plug-and-play".

Answer 20

Oh, thank you :)

Answer 21

No problem. :)