Please explain...I'm writing the PSAT in an hour.
2007-10-17 08:24:52 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
If f(x) = √2x then f(c) = √2c
So if f(c) = 4 then √2c = 4
There are 2 ways I can read your equation.
√2c = (√2)c or √2c = √(2c)
(√2)c = 4 -> c = 4/√2 = 4√2/2 = 2√2
√(2c) = 4 -> 2c = 16 --> c=8
Hope that helps!
2007-10-17 08:31:36 · answer #1 · answered by Astral Walker 7 · 0⤊ 0⤋
question a million f(x)=sqrt 2x f(c)=sqrt 2c=4 2c=4^2 2c=sixteen c=8 B question 2 3x+8y=10 8y=-3x+10 y=(-3/8)x+5/4 y=ax+5 slopes are equivalent in parallel lines a=-3/8 C question 3 (x+y)^2 - (x-y)^2 = 80 4 ((x+y)+(x-y))((x+y)-(x-y)) = 80 4 (2x)(2y)=80 4 4xy=80 4 xy=21 x=7 and y=3 x+y=10 A
2016-12-18 10:06:17 · answer #2 · answered by Anonymous · 0⤊ 0⤋
√2c = 4
2c = 16
c = 8
2007-10-17 08:29:07 · answer #3 · answered by ironduke8159 7 · 0⤊ 0⤋
I think you substitute x for 4.
2007-10-17 08:52:41 · answer #4 · answered by Anonymous · 0⤊ 0⤋
sqrt(2x)=4
2x = 16
x = 8
so f(8) = 4
if it is sqrt(2)*x = 4
then x = 4/sqrt(2) = 2sqrt(2)
2007-10-17 08:31:16 · answer #5 · answered by norman 7 · 0⤊ 0⤋