Question

5x^2-7x=4 find -13f(7)-6f(-10)

Answer 1

first lets us know what is f(x)?

Answer 2

f(x) is 5x^2-7x=4

Answer 3

^2 means to the second power

Answer 4

f(x, y) = x
3
+ xy + y
3
+ 1
f(0, 0) = 1
f(1/3, 1/3) = 32/27
f(−1/3, −1/3) = 28/27

0 0

= Df =
h
∂f
∂x
∂f
∂y
i
=

3x
2 + y x + 3y
2

Answer 5

is the answer corect

Answer 6

helpingtutors

Answer 7

i dont understand the answer, the questions says, if f(x)=5x^2-7x=4, find -13f(7)-6f(-10)

Answer 8

Does it perhaps say f(x)=5x^2-7x+4? The equals there makes no sense.

Answer 9

then it says find the foll owing values: -13f(7)-6f(-10)

Answer 10

Ok, then.
\[f(x)=5x^2-7x+4\]
\[f(7)=5*7^2-7*7+4\]\[f(7)=5*49-49+4\]\[f(7)=200\]
\[f(-10)=5*-10^2-7*(-10)+4\]\[f(7)=5*100+70+4\]\[f(7)=574\]
\[-13f(7)-6f(-10)=-13*200-6*574 = -6 044\]

Answer 11

Those 7s should be -10s in the second paragraph

Answer 12

so the second answer is wrong?

Answer 13

No, I just forgot to put -10s in the brackets (I copied and pasted)

Answer 14

i'm sorry but how did you get -10?

Answer 15

You were asked to find -13f(7)-6f(-10)
In the first paragraph thing, I worked out f(7) and in the second I did f(-10)

Answer 16

yes