Question

evaluate the following for. p=-1, q=-3, r=7:
(a) p³+pqr - pr²
plsssss solve my problem​

Answer 1

$= 1 + 1 \times 3 \times 7 - 1 \times 7 { }^{2} \\ = 1 + 21 - 1 \times 7 {}^{2} \\ = 1 + 21 - 7 {}^{2} \\ = 1 + 21 - 49 \\ = 22 - 49 \\ = 73$