Question

Solve 5x^2 - 7x + 2 = 0 by completing the square.

What is the constant added on to form the perfect square trinomial?

a) 49/4
b) 49/25
c) 49/100

Answer 1

Same story as before.

Answer 2

I don't get how to do these.

Answer 3

@Nurali Got this?

Answer 4

5x^2 - 7x + 2
Divide by 5
x^2 - 7x/5 + 2/5 = 0
x^2 - 7x/5 = -2/5
Take half of the constant for the x term and square it: half of 7/5 is 7/10, squared is 49/100. Add this to both sides of the equation
x^2 - 7x/5 + 49/100 = -2/5 + 49/100
x^2 - 7x/5 + 49/100 =9/100
(x - 7/10)^2 = 9/100
i think 49/100