Question

2. The value of the polynomial 7x + 3x² - 4, when x = - 2 is
a) 100
b) 110
c) 120
d) 130​

Answer 1

Answer:

-6

Step-by-step explanation:

$p(x) = 7x + 3 {x}^{2} - 4$

$p(x) = 3 {x}^{2} + 7x - 4$

$when \: x = - 2$

$p(x) = 3 {x}^{2} + 7x - 4$

$= 3 { (- 2)}^{2} + 7( - 2) - 4$

$= 12 - 14 - 4$

$= - 6$

hence, the actual value of polynomial when x= -2 is -6 which is not mentioned in given options.

hope it helps

Answer 2

Answer:

(b) 130

The sum of all the exterior angles of a triangle is 360°.

Given:

x + 110° + 120° = 360°

or, x = 360° - 230°

or, x = 130°

Step-by-step explanation: