Question

If a = -2,find the values of the following polynomials.​

(I) 2a + 4

(II) 7 -3a

(III) a2 + 1

(IV) 4 - a2

Answer 1

Answer:

Step-by-step explanation:

(i) 2a + 4

= 2(-2) + 4

= -4 + 4

= 0

(ii) 7 - 3a

= 7 - 3(-2)

= 7 - (-6)

= 7 + 6

= 13

$(iii) a^{2} + 1 \\= (- 2)^{2} + 1 \\= +4 + 1\\=5$

$(iv) 4 - a^{2} \\= 4 - (-2)^{2} \\= 4 - (+4)\\= 4 - 4 \\= 0$