Question

let f(x)=2x^2+x-3

f(t+3)
f(m+2)-f(m)

Answer 1

Substitute (t-3) into all the x same goes to the next question.

Answer 2

Substitute (t-3) or (t+3).........?

Answer 3

@paki t+3

Answer 4

yeah (t+3), then put it in the function and see...

Answer 5

Whoops, sorry (t+3) I mean.

Answer 6

@LXelle i got this answer 2t^2+13t+18 is this correct??

Answer 7

Yes then solve to find t. :)

Answer 8

how??

Answer 9

Factorization. :)

Answer 10

@LXelle i got this answers
t= 9/2 and t=2

Answer 11

It should be negative for both answers.

Answer 12

why?? i don't get it

Answer 13

If t is 2, then your equation cannot be = 0. The rule of factorizing is to let the equation =0

Answer 14

The trick is after you get the answer try substituting back into the equation to see whether the answer gives back the same answer as before.

Answer 15

ahh i get it ! thanks @LXelle :D

can you help me solve the last one?? i have a hard time to solve it :(

Answer 16

The same thing though. Substitute the (m+2) first then make another one by substituting m only . Then minus the both equations.