Question

Simplify 4x (5x – 5) - 30 and find its values for x = 2​

Answer 1

Answer:

4x(5x-5)-30

Step-by-step explanation:

when x= 2

f(x) = 4X2 (5X2 - 5) -30

=> 8 (10-5) -30

=> 8 X 5 - 30

=> 40-30

=> 10

Answer 2

Correct Question ::

Simplify :-

4x (5x - 5) - 30 and find its value, if x = 2,

Answer ::

The value of 4x ( 5x - 5 ) - 30 is 10.

Step-by-step explanation ::

$\bf{ \mapsto \: 4x(5x - 5) - 30} \\ \\ \\ \sf{ \mapsto \: 4 \times 2(5x - 5) - 30} \\ \\ \\ \sf{ \mapsto \: 8(5 \times 2 - 5) - 30} \\ \\ \\ \sf{ \mapsto \: 8(10 - 5) - 30} \\ \\ \\ \sf{ \mapsto \: 8(5) - 30} \\ \\ \\ \sf{ \mapsto \: 8 \times 5 - 30} \\ \\ \\ \sf{ \mapsto \: 40 - 30} \\ \\ \\ \bf{ \mapsto \: 10} \: \: \: \: \: \dag$

Hence, the value of 4x(5x-5)-30 is 10.

Now Verification,

$\bf{ \mapsto \: 4x(5x - 5) - 30 = 10} \\ \\ \\ \sf{ \mapsto \: 4 \times 2(5x - 5) - 30 = 10} \\ \\ \\ \sf{ \mapsto \: 8(5 \times 2 - 5) - 30 = 10} \\ \\ \\ \sf{ \mapsto \: 8(10 - 5) - 30 = 10} \\ \\ \\ \sf{ \mapsto \: 8(5) - 30 = 10} \\ \\ \\ \sf{ \mapsto \: 8 \times 5 - 30 = 10} \\ \\ \\ \sf{ \mapsto \: 40 - 30 = 10} \\ \\ \\ \bf{ \mapsto \: 10 = 10} \: \: \: \: \: \dag$

L.H.S = R.H.S

Hence, Verified !