Question

Find the value of following, if p = – 1.

(i) 4p + 5

(ii) -3p² + 4p + 8

(iii) 3(p – 2) + 6

Answer 1

(i) In 4p + 5 put p =-1

4p + 5 

= 4 x (-1) + 5

= -4 + 5 

= 1

(ii) In -3p² + 4p +8 put p = -1

-3p² + 4p + 8 

= -3(-1)²+ 4(-1) + 8

= -3 x 1 – 4 + 8

= -3 – 4 + 8 

= 1

(iii) In 3(p – 2) + 6 put p = -1

3(p – 2) + 6 

= 3 (-1 – 2) + 6

= 3(-3) + 6 

= -9 + 6 

= -3