Question

If x= −1 is a zero polynomial 3x3+ax 2+7x-2 , find the value of a.​

Answer 1

Answer:

3x3+ax 2+7x-2

3(-1) ³+a(-1)²+7(-1) -2=0

-3+a-7-2=0

a-12=0

a=12

Answer 2

Step-by-step explanation:

Here, f(x)= 3x³+ax²+7x-2

We have given the value of x= -1

Now, 3x³+ax²+7x-2=0

=> 3(-1)³+a(-1)²+7(-1)-2=0

=> -3+a-7-2=0

=> -3+a-9=0

=> -12+a=0

=> a= 12