Question

x la a doua - 20x + 75
x la a doua - 9x - 52
("-" e minus)

Answer 1

Răspuns

Explicație pas cu pas:

$x^{2} -20x+75=0\\x^{2} -15x-5x+75=0\\x(x-15)-5(x-15)=0\\(x-5)*(x-15)=0\\ x=5;x=15\\x^{2} -9x-52=0\\x^{2} -13x+4x-52=0\\x(x-13)+4(x-13)\\ (x+4)(x-13)=0\\\\x+4=0\\x=-4\\x-13=0\\ x=13$