Question

If a = 2, b = -2, c = -5 then find the value of b – 4ac.

Answer 1

Answer:

The value of b - 4ac is 38

Step-by-step explanation:

Given equation is b - 4ac

Putting the value of a,b,c in the equation,

We get,

-2 - 4 × 2× (- 5)

= -2 -(- 40)

=- 2 +40

= 38

Answer 2

Given,

a = 2, b = -2, c = -5

To find,

The value of b - 4ac

Solution,

Since,

b- 4ac

We have to first multiply b with c i.e. is -2 and -5 respectively and then we have to subtract it from the value of b i.e. is -2, we get

⇒  -2 - 4(2)(-5)

Two - and - sign when multiplied would give the positive number and therefore on multiplying -2 and -5 we get value as 10

⇒  -2 + 40

⇒ 38

Hence, If a = 2, b = -2, c = -5 then find the value of b – 4ac is 38.