Question

Simplify : a^2 - a 12 × a^2 - 4​

Answer 1

Step-by-step explanation:

(81)

4

−1

×

81

=(3)

4×

4

−1

×9

=(3)

−1

×3

=

3

1

×3

=1

Answer 2

Step-by-step explanation:

Let 2a−b=x

So the equation is x

2

+2x−8=0

x

2

+4x−2x−8=0

x(x+4)−2(x+4)=0

(x−2)(x+4)=0

x=2,−4

So, 2a−b=2;2a−b=−4

2a=b+2;2a=b−4