Question

Evaluate the following expression using the values given:

Find 2r2 + 3s3 - r2 + 4t2 - r2 if r = -2, s = -3, and t = 5.

-19

-37

27

19

Answer 1

For the answer to the question above,
2r^2 + 3s^3 - r^2 + 4t^2 - r^2

r = -2 
s = -3
t = 5

First, we should substitute everything into the expression 

(2)((-2)^2) + (3)((-3)^3) - (-2^2) + (4)(5^2) - (-2^2)

Now we should simplify the exponents 

(2)(4) + (3)(-27) - (4) + (4)(25) - (4)

Now we simplify the brackets 

8 + (-81) - 4 + 100 - 4

so 8 minus 81 minus 4 plus 100 minus 4 is equal to +19
I hope this helps.