brandenrodriguez305 brandenrodriguez305

24-06-2022
Mathematics

contestada

Solve using the factoring method: x2 + 4x - 21 = 0

Respuesta :

26-06-2022

Answer:

x² + 4x - 21 = 0

x² + 7x - 3x - 21 = 0

x ( x + 7 ) -3 ( x + 7 ) = 0

( x - 3 ) ( x + 7 ) = 0

∴ x - 3 = 0 or x + 7 = 0

x = 0 + 3 x = 0 - 7

x = 3 x = -7

Answer Link

Otras preguntas

solve this quadratic equation by completing the square. X^2+4x+15

What is the difference between a example and a illustration?

a recipe uses 3 cups of gated cheese to make 10 servings. how much cheese is needed to make 6 servings?

How can analogies help a reader? 1.They can help to illustrate meaning for the reader. 2.They can help to make the text challenging to understand. 3.They can h

Health care is considered a(n) ______ career field.

You read a headline that states, "Bill vetoed; Veto overridden." Which branches of government would have been involved in this process?

A 10.5-gallon aquarium is 2/3 full. How many more gallons of water does it take to fill the aquarium?

The n = 8 to n = 4 transition in the bohr hydrogen atom occurs in the __________ region of the electromagnetic spectrum.

why would it be hard to find the ideal light intensity if the temperature were very hot or cold?

Which of the following provided for the creation of government in the Northwest Territory?