Question

Find the value of a2 + 5a – 4 when a = 1, - 1 and 2.​

Answer 1

Answer:

a = 1

1 +5-4 = 2

a =2

4+10-4 = 10

a = -1

1-5-4 = - 8

Answer 2

Step-by-step explanation:

Given,

a^2+5a-4=0

Values of a to be substituted are 1,-1 and 2

Let a=1

=(1)^2+5(1)-4

=1+5-4

=6-4

=2

So the value of the equation a^2+5a-4 will be 2 if we substitute the value of a as 1.

Let a= -1

=(-1)^2+5(-1)-4

=1-5-4

=1-9

= -8

So the value of the equation a^2+5a-4 will be -8 if the we substitute the value of a as -1.

Let a=2

=(2)^2+5(2)-4

=4+10-4

=14-4

=10

So the value of the equation a^2+5a-4 will be 10 if the we substitute the value of a as 2.