Anonymous

What Is X Squared + 4x - 5 = 0?

3 Answers

Aisha Profile
Aisha answered
It is very simple to solve the above equation. The solution is as follows:
X Squared + 4x - 5 = 0
x(x+4)-5=0
x(x+4)=5
x=5/x+4
x=5/x+5/4
x-5/x=5/4
x square - 5=5/4
xsquare =5/4+5
x = square root (25/4)
x=5/2 is the required answer.
Anonymous Profile
Anonymous answered
Since the trinomial is equal to zero, you need to get two sets of binomials equal to zero:

X(squared) + 4x - 5 = 0
(x + 5)(X-1) = 0
x+5=0
x=-5
x-1=0
x=1

You can go as far as checking your answers by substituting the numbers where the x's are:

-5(squared) + 4*-5 - 5 = 0
25-20-5=0 This statement is true so -5 works

1(squared) + 4*1 - 5 = 0
1+4-5=0 This statement is true so one works also

Thus, your solution set is: {-5 , 1}

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