Question

x elevado a 2+(7-x)elevado a 2=25


urge ahorita

Answer 1

sea x elevado a la 2=x^2 entonces:
x^2+(7-x)^2=25
x^2+[49-14x+x^2]=25
2x^2-14x+49-25=0
2x^2-14x+24=0
sacando mitad
x^2-7x+12=0
(x-3)(x-4)=0
x=3 ó x=4