Roots and coefficient

In the equation 2x ^ 2 + bx-9 = 0 is one root x1 = -3/2. Determine the second root and the coefficient b.

Correct answer:

b =  -3
x2 =  3

Step-by-step explanation:

a=3/2=32=112=1.5  2 a2+b a9=0 2 (1.5)2+b (1.5)9=0  1.5b=4.5  b=3=3

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