Please help, I'm lost! I keep getting 1,5566.20 but that's incorrect. Problem below:

Question

jaylelile · Answer

$$3x+5y ^{2}+8x ^{2}; x=1.208, y=7.666$$

anonymous · Answer

just substitute the known values into the function? use a calc?

jaylelile · Answer

I keep getting the same answer that isn't right though...

anonymous · Answer

$$3(1.208)+5(7.666)^2+8(1.208)^2$$

mathstudent55 · Answer

$\large 3\color{red}{x}+5\color{green}{y} ^{2}+8\color{red}x ^{2}; \color{red}{x=1.208}, \color{green}{y=7.666}$

$\large 3(\color{red}{1.208})+ 5(\color{green}{7.666} ^{2})+8(\color{red}{1.208} ^{2}) $

mathstudent55 · Answer

Do the squares first.

mathstudent55 · Answer

$\large 3(\color{red}{1.208})+ 5(\color{green}{7.666} ^{2})+8(\color{red}{1.208} ^{2})$

What do you get for $7.666^2$?
What do you get for $1.208^2$?

jaylelile · Answer

ohhh I wasn't doing it in the right order.... I got 58.76 and 1.459

mathstudent55 · Answer

$\large 3(\color{red}{1.208})+ 5(\color{green}{58.767556})+8(\color{red}{1.459264})$

mathstudent55 · Answer

Now do the 3 multiplications.

jaylelile · Answer

Do the multiplications and then add. I got 309.17 for my final answer.

jaylelile · Answer

thank you so much!

mathstudent55 · Answer

$\large 3(\color{red}{1.208})+ 5(\color{green}{58.767556})+8(\color{red}{1.459264})$

$= 3.624 + 293.83778 + 11.674112$

$=309.135892$

mathstudent55 · Answer

You're welcome.

anonymous · Answer

I got 99.612 one time, 309.135892 the second.