Question

If a = 2b, b = -c, C=0.6, then what is the value of 5a2 +2b-c?
3
(1) 4.6
(2) 7.5
(3) 3.4
(4) 8.7​

Answer 1

Answer:

5.4

Step-by-step explanation:

5a² + 2b - c

a = 2b , b = -c , c = 0.6

b = -0.6

a = 2 x (-0.6) = -1.2

Now,

5(-1.2)² + 2(-0.6) - (0.6)

= 5(1.44) - 1.2 - 0.6

= 7.2 - 1.8

= 5.4