Question

Solve the equation

4x squared =121

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

Answer 1

Answer:B

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