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HELP ASAP I DON'T UNDERSTAND​

HELP ASAP I DON'T UNDERSTAND​-example-1
User Kareema
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Answer:

A

Explanation:

x² + 7x + 12 = 0

consider the factors of the constant term (+ 12) which sum to give the coefficient of the x- term (+ 7)

the factors are + 3 and + 4 , since

3 × 4 = + 12 and 3 + 4 = + 7 , then

(x + 3)(x + 4) = 0

equate each factor to zero and solve for x

x + 3 = 0 ⇒ x = - 3

x + 4 = 0 ⇒ x = - 4

User Dhirendra
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