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How would you do number 12 and 15?

How would you do number 12 and 15?-example-1

1 Answer

6 votes

Answer:


x_1=x_2=-(2)/(3)

Explanation:

For the quadratic equation
ax^2+bx+c=0 the discriminant is defined as


D=b^2-4ac

and the quadratic formula for the roots gives us two roots:


x_1=(-b-√(D))/(2a)

and


x_2=(-b+√(D))/(2a)

For the equation
9x^2 +12x+4=0 use quadratic formula to find roots:


D=12^2-4\cdot 9\cdot 4=144-144=0

So,


x_1=x_2=(-12\pm √(0))/(2\cdot 9)=-(12)/(18)=-(2)/(3)

User Dennis Fischer
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