Question

Value of expression 5n2-20n=at is

Answer 1

(1): "n2" was replaced by "n^2".

Step by step solution :

STEP

1

:

Equation at the end of step 1

5n2 - 20n = 0

STEP

2

:

STEP

3

:

Pulling out like terms

3.1 Pull out like factors :

5n2 - 20n = 5n • (n - 4)

Equation at the end of step

3

:

5n • (n - 4) = 0

STEP

4

:

Theory - Roots of a product

4.1 A product of several terms equals zero.

When a product of two or more terms equals zero, then at least one of the terms must be zero.

We shall now solve each term = 0 separately

In other words, we are going to solve as many equations as there are terms in the product

Any solution of term = 0 solves product = 0 as well.

Solving a Single Variable Equation:

4.2 Solve : 5n = 0

Divide both sides of the equation by 5:

n = 0

Solving a Single Variable Equation:

4.3 Solve : n-4 = 0

Add 4 to both sides of the equation :

n = 4

Answer 2

Answer:

Let n=1.,therefore 5×(1)2-20×1=-10

Step-by-step explanation:

let n=2,the same as above.Come on,you can do it