Find the value of following, if p = – 1.(i) 4p + 5(ii) -3p2 + 4p +

1.	Find the value of following, if p = – 1.(i) 4p + 5(ii) -3p2 + 4p + 8(iii) 3(p – 2) + 6
Answer» (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

Find the value of following, if p = – 1.(i) 4p + 5(ii) -3p2 + 4p + 8(iii) 3(p – 2) + 6

Answer»

(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