Question

evaluate the following for p = -1,q = -3,r = 7: (a) p^3+pqr-pr^2 ( tell by process)​

Answer 1

$\bf\huge\underline{\underline{ Given :- }}$

• p = - 1

• q = -3

• r = 7

$\bf\huge\underline{\underline{ To \: Find:- }}$

• p³ + pqr - pr

$\bf\huge\underline{\underline{ Answer :- }}$

• p³ + pqr - pr

putting the values of p , q and r ,

• $\red{\implies}$ (-1)³ + (-1)(-3)7 -(-1)7²

• $\red{\implies}$ -1 + 21 + 49

• $\red{\implies}$ 69

$\rule{10cm}{0.05cm}$

[tex] \bf\huge\underline{\underline{ Formulas \: used:- }} [/tex

• (-a)² = a²

• (-a)³ = -a

• (-a)(-b) = ab

• (+a)(-b) = -ab

Answer 2

p³+pqr-pr²

=(-1)³+(-1)×(-3)×7-(-1)×7²

=(-1)+3×7+1×7²

=(-1)+21+49

=(-1)+70

=69

Answer:69