panda557 panda557

03-06-2016
Mathematics

contestada

What is x^2+x-20=0.
please help

Respuesta :

meerkat18 meerkat18

03-06-2016

x² + x - 20 = 0

x² = x * x
x = the sum of the factors of -20
-20 ⇒ 1 x 20
2 x 10
- 4 x 5 ⇒ only these factors can arrive to a sum of 1

(x - 4)(x + 5) = x(x+5) - 4(x+5) = x² + 5x - 4x - 20 = x² + x - 20

x - 4 = 0
x = 4

x + 5 = 0
x = -5

Answer Link

Otras preguntas

How did General Sherman’s “March to the Sea” affect the Confederacy during the Civil War?

What is 100 • 100, using standard multiplication?

twenty five minus fifteen equals

Find the volume of a cylinder of height 6" and base with circumference 16 pi". A.96 pi cubic units B.192 pi cubic units C.384 pi cubic units

Which kind of molecule is used by organisms to store and transmit genetic material?

Help Please Is the following relation a function?

After a reaction has gone to completion, it is not reversible.

Explain how water can be an abiotic environmental factor when it is essential to all life on earth.

Find the inverse of the function y = 2x2 + 2

How can you prove a triangle is isosceles? (4 points) Use the distance formula to see if at least two sides are congruent. Use the slope formula to see if any s