Using the quadratic formula, the solutions are:
a) 
b) 
<h3>What is a quadratic function?</h3>
A quadratic function is given according to the following rule:

The solutions are:


In which:

Item a:
The coefficients are a = 2, b = -3, c = -4, hence:
Item b:
The coefficients are a = 1, b = 2, c = 2, hence:
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Answer:
6/8, 2/3, 3/7
Step-by-step explanation:
3/7=0.4285
6/8=0.76
2/3=0.6666
Step-by-step explanation:
3x²+4=31
3x²=31-4
3x²=27
x²=27÷3
x²=9
x=±3