Question

Mariya is solving the quadratic equation by completing the square.

4x2-20x+3=0

4x2-20x=-3

A(x2-5x)=-3

What is the value of A?

-20
3
4
5

Answer 1

Answer: A is 4

Explanation:

Using the completing the square method to solve;

4x² - 20x + 3 =0

First take 3 to the right hand side

4x² - 20x = -3

Factor out 4, since 4 is a fctor of 4 and 20

The equation becomes;

4(x² - 5x) = -3

Therefore comparing this equaton with A(x² - 5x) = -3

A = 4

Answer 2

A=4

Explanation:

Mariya was solving:

4x2-20x+3=0

4x2-20x=-3

A(x2-5x)=-3

At this point, we can know that 4*x2=4x2 and 4*5x=20x, son A=4