The answer to the question is letter C. 4(x + 3). The expression means that the sum of x and 3 is multiplied by 4. This expression should be equal or greater than 28. All the other choices do not satisfy the inequality.

7 0

4 years ago

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X^2−4x−21 I need help with this question and please right every step of it

Damm [24]

Answer:

<h3> $\boxed{ \boxed{ \sf{ \bold{( x - 7)(x + 3)}}}}$ </h3>

Step-by-step explanation:

$\sf{ {x}^{2} - 4x - 21}$

Here, we have to find the two numbers that subtracts to 4 and multiplies to 21

⇒ $\sf{ {x}^{2} - (7 - 3)x - 21}$

⇒ $\sf{ {x}^{2} - 7x + 3x - 21}$

Factor out X from the expression

⇒ $\sf{ x(x - 7) + 3x - 21}$

Factor out 3 from the expression

⇒ $\sf{x(x - 7) + 3(x - 7)}$

Factor out x-7 from the expression

⇒ $\sf{(x - 7)(x + 3)}$

Hope I helped!

Best regards!!

3 0

3 years ago

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Need help with this

chubhunter [2.5K]

It’s the second one, b

5 0

4 years ago