Question

Evaluate the following expression using the values given: Find 2r2 + 3s3 − r2 + 4t2 − r2 if r = −2, s = −3, and t = 5. A. 19 B. 27 C. -19 D. 37

Answer 1

Answer:A. 19

Step-by-step explanation:

Answer 2

$Given \: r = -2 , s = -3 \:and \: t = 5 \:then$

$\red{ The \: value \: of \: 2r^{2}+3s^{3}-r^{2}+4t^{2}-r^{2}}$

$= ( 2 - 1 - 1 )r^{2} + 3s^{3} + 4t^{2}$

$= 3s^{3} + 4t^{2}$

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

$= 3 \times (-27) + 4 \times 25$

$= -81 + 100$

$= 19$

Therefore.,

$\red{ The \: value \: of \: 2r^{2}+3s^{3}-r^{2}+4t^{2}-r^{2}}$

$\green { = 19 }$

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