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x+3=0
x= -3
f(-3)=4×-27 +9a -3b -15 =0
-108+9a-3b-15=0
9a-3b=123
3a-b=41 (1)
2x+3=0
x= -3/2
f(-3/2)=4×-27/8+9/4a-3/2b-15=6
-27/2+9a/4-3b/2_15=6
9a/4-3b/2=6+27/2+15=69/2
3a/2-b 69/2÷3/2
3a-2b=23×2 (2)
now from 1 and 2
3a=41+b
41+b-2b=46
b= -5
3a=41-5=36
a=12
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