The number x satisfies 5x^2 + 4 = 3x + 9. Find the value of $(10x - 3)^2$.

samus May 22, 2019

#2**+1 **

Use the Quadratic Formula to find the value of x in the first part. Then sub that value for x in the second part.

Guest May 23, 2019

#4**+1 **

The number x satisfies 5x^2 + 4 = 3x + 9. Find the value of $(10x - 3)^2$.

**Guest has given you a very good teaching answer.**

**And you have responded appropriately.**

**I am very pleased with both of you.**

This is what i suggest.

Find the answer for x - yes I know there will be 2 answers but just leave them with the plus/minus answer. You will not need to seperate them.

You can work out both at onces.

You have x= [3(+ or -)√109]/10

now find 10x

then find 10x - 3

Now it is easy to square it. Both answers will be the same.

Melody May 23, 2019