Question

EXERCISE 6.2
(d) a +1
1. Find the value of the following expressions for a = -4.
(a) a - 9
(b) 3a - 5
(c) a - a² + at 1
2. If p = 0 and q = 3, evaluate:
(a) 8p- 7pq + 3 (b) 4p! -6p q +64 (c) (p + 9) -9)
(d) p² + pq + 9​

Answer 1

Answer:

1) 3a - 5

2) 8p- 7pq + 3 (b) 4p! -6p q +64 (c) (p + 9) -9)

Answer 2

Answer:

1.(a)-13

(b)-17

(c)-19

2.(a)3

(b)64

(c)0

(d)9

Step-by-step explanation:

1. Given,

a=-4

(a)a-9

Putting the value of a in

a-9

=-4-9

=-13(Ans.)

(b)3a-5

Putting the value of a in 3a-5

=3(-4)-5

=-12-5

=-17(Ans.)

(c)a-a²+1

Putting the value of a in a-a²+1

=(-4)-(-4)²+1

=-4-16+1

=-19(Ans.)

2. Given,

p=0 and q=3

(a) 8p- 7pq + 3

Putting the values of p and q in

8p- 7pq + 3

=8(0)-7(0)(3)+3

=0-0+3

=3(Ans.)

(b)4p-6pq +64

Putting the values of p and q in

4p-6pq+64

=4(0)-6(0)(3)+64

=0-0+64

=64(Ans.)

(c) (p + 9) -9

Putting the values of p and q in

(p + 9) -9

=(0+9)-9

=9-9

=0(Ans.)

(d)p² + pq + 9

Putting the values of p and q in

p² + pq + 9

=(0)²+(0)(3)+9

=0+0+9

=9(Ans.)

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