Answer:
diagonals are perpendicular......its not true
Step-by-step explanation:
hiiii
Let the unknown number be x.
Given,






x =

= 1.28
Hence, the number is 1.28
Let's expand the products they are all in the form

For the first one we have a=x and b=2i:

For the second one we have a=x-2 and b=2i:

For the third one we have a=x+1 and b=i:

3[x+3(4x-5)]=15x-24; x+12x-15=5x-8 (divide both sides by 3); 8x=7 (move all the x's to one side), x=7/8