Question

the function f is defined by f(x)=2x^2-1 find f(2y) .......can someone help me please will medal

Answer 1

you haven't written the correct question

Answer 2

Is it "find f(2y)"

Answer 3

yes i changed it :)

Answer 4

@FaiqRaees

Answer 5

Okay so in place of x write 2y and rewrite the function

Answer 6

\[\large\rm f(x)=2x^2-1 \]\[\large\rm f(x)=2(2y)^2-1 \]

Answer 7

oh ok i wrote it wrong

Answer 8

No you didnt write it wrong. The equations I wrote are part of the solution

Answer 9

ok so would you take 2y times 2y then times it by 2 or am I way off base

Answer 10

@FaiqRaees

Answer 11

correct

Answer 12

\[\large\rm f(x)=(2*2y*2y)-1 \]

Answer 13

so would it be f(x) =8y-1 @FaiqRaees

Answer 14

No y times y is y squared
so 2y times 2y is 4 y squared
and 4 y squared times 2 is 8 y squared

Answer 15

oops i forgot my squared

Answer 16

would I write it as f(2y)=8y^2-1

Answer 17

@FaiqRaees

Answer 18

Perfect

Answer 19

Thank you so much

Answer 20

@FaiqRaees

Answer 21

You are welcome