Shenika factored the polynomial completely. What is the value of A?

5x3+35x2+6x+42

(5x2+A) (x+B)

1

5

6

7

A = 6

Step-by-step explanation:

Given

5x³ + 35x² + 6x + 42 (factor the first/second and third/fourth terms)

= 5x² (x + 7) + 6 (x + 7) ← factor out (x + 7) from each term

= (x + 7) (5x² + 6) ← in factored form

Thus

(5x² + 6) → (5x² + A) ⇒ A = 6

A = 6

B = 7

(5x^2+6) (x+7)