Question

7x²- 5x+ k = -4. given that x= -2​

Answer 1

Step-by-step explanation:

7x²- 5x+ k = -4

Putting x= -2

$7 \times ( - 2^{2} ) - 5 \times ( - 2) + k = - 4 \\ \\ 28 + 10 + k = - 4 \\ \\ 38 + k = - 4 \\ \\ k = - 4 - 38 \\ \\ = - 42$

Answer 2

Answer:

7(-2²) - 5(-2)+k = _4

7(4) +10 + k= - 4

28 + 10 + k = - 4

38 + k = - 4

k = - 4 - 38

k = - 42

Step-by-step explanation:

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