So first you mulitply 16x4 next you multipy 64x65
F(x)=2x^2-10
f(5)=2(5^2)-10
f(5)=2(25)-10
f(5)=50-10
f(5)=40
Don't sweat it. It looks complex but i will try to help explain it.
First all this equation ids saying is 8 times a number k divided by 3=32
So,First we get rid of the three.So it says divide by three so we do the opposite operation. So.So 32*3=96
Now we have 8k=96
So our goal is to get x by it self so we divide by 8 because we need to do do the opposite operation.
We get x=12
I usually just type sqrt of ___. It works.
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sorry if I couldn't help
Math uses numbers and equations, and science requires the scientific method and experimentation
