what triangle you have a picture?
X (X - 1) = 342
x² - x = 342
x² - x - 342 = 0
X = 19
Integers are like
-3,-2,-1,0,1,2,3....
so between 3.4 and 6.3 is
4,5,6
those aer the integers
(x+13)*(x-7)=0
Split into possible cases :
________________________
x+13=0
x-7=0
Solve the equations:
________________________
x= -13
x= 7
Final solution :
