l x^2 - 4x - 5 l = 7 we have two equations here......
The first is :
x^2 - 4x - 5 = 7 subtract 7 from both sides
x^2 - 4x - 12 = 0 factor
(x - 6) ( x + 2) = 0 and, setting each linear factor to 0 means that x= 6 or x = -2
The second equation is :
-(x^2 - 4x - 5) = 7 multiply both sides by -1
x^2 - 4x - 5 = -7 add 7 to both sides
x^2 - 4x + 2 = 0 the solution to this is:
x2−4×x+2=0⇒{x=2−√2x=√2+2}⇒{x=0.585786437626905x=3.414213562373095}
Thus...we have 4 values that make this true....
l x^2 - 4x - 5 l = 7 we have two equations here......
The first is :
x^2 - 4x - 5 = 7 subtract 7 from both sides
x^2 - 4x - 12 = 0 factor
(x - 6) ( x + 2) = 0 and, setting each linear factor to 0 means that x= 6 or x = -2
The second equation is :
-(x^2 - 4x - 5) = 7 multiply both sides by -1
x^2 - 4x - 5 = -7 add 7 to both sides
x^2 - 4x + 2 = 0 the solution to this is:
x2−4×x+2=0⇒{x=2−√2x=√2+2}⇒{x=0.585786437626905x=3.414213562373095}
Thus...we have 4 values that make this true....