Question

Aflati ca numarul real a=$( x^{2} -7x)( x^{2} -7x-10)+25$ este patrat perfect

Answer 1

a = (x²-7x)(x²-7x)-10(x²-7x)+5²
a =(x²-7x)²-2*5*(x²-7x)+5²
a =(x²-7x-5)²
=> a e patrat perfect :)
Sper ca ai inteles :)