Question

Help me please, it's due tomorrow!

Calculate the numerical value of expressions


A)
`x^(2)` - 2y to X=-3 and Y=5



B)
`3a^(2)`
`- b^(2)` to A=-2 and B=-7



C)
`(a^(2) + b^(2))/(2 )` para
`\left \ {{a=-1} \atop {b=-2}} \right.`



D)
`(ab+c)/(ab-c)` para A=2, B=5 e C=3



E)
`(a+b)/(3)` +
`(2a)/(5)` para A=1 e B=-7



F)
`5a^(3) + 3ab` to A=-3 and B=4

Answer 1

A) -19

B) -37

C) 1

D)
`(13)/(7) \\`

E)
`(-8)/(5)`

F) -28

Explanation:

You have to plug the variables into the spots that they go into. Once you have done that, you can begin solving. Once you have your answer, you can always plug it back into the problem to make sure it makes sense.