Question

Evaluate the following expression using the values given: Find 2r2 + 3s3 − r2 + 4t2 − r2 if r = −2, s = −3, and t = 5.

Answer 1

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

Answer 2

2($-2)^{2} +3(- 3)^{3} -(- 2)^{2} +4( 5)^{2} -( -2)^{2}$
=