maggie444 maggie444

21-03-2017
Mathematics

contestada

solve the equation
4x squared =121

A 2.75,-2.75
B 5.5,-5.5
C 11,-11
D 30.25,-30.25

Respuesta :

Favouredlyf Favouredlyf

01-11-2019

Answer:B

Step-by-step explanation:

4x2 =121

4x2-121=0

using the general formula

[-b( +/-) √b2-4ac]/2a

a=4, b= 0, c=-121

x= [0 ( +/-)√02-(4*4*-121)]/2.4

= ( +/-)√1936)/8 = ( +/-)5.5

x =5.5

x = -5.5

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