What are the roots of x in -10x2 + 12x − 9 = 0

Step-by-step explanation:

Given :

To Find: What are the roots of x?

Solution:

We will solve this by quadratic formula :

Formula :

General form of quadratic equation:

On Comparing the given equation with general form.

a = -10

b= 12

c = -9

Substitute the values in the formula :

Hence the roots of x are  

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step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15