Question

for what value of k, -2 is a root of 3x^2 +4x +2k= 0

Answer 1

Answer:

↗ refer to the attachment ↗

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Answer 2

Answer:

first we will put -2 in place of x for finding value of k

3(-2)² + 4(-2) + 2k = 0

now square of -2 is 4

3(4) + 4(-2) + 2k = 0

now ³ into 4 is 12 and 4 into -2 is -8

so

12 + (-8) + 2k = 0

now + - is minus so 12 + (-8) will become

12 - 8 + 2k = 0

now 12 - 8 is 4

4 + 2k = 0

now taking 4 on right hand side it will become - 4

2k = - 4

k = -4/2

k = -2