x edad de pedro
x+11 =(x-13)² /2
2(x+11)=(x-13)²
2x+22=(x-13)²
2x+22=x²-26x+169
x²-26x+169-2x-22=0
x²-28x+147=0
−b±√b²−4(ac)/2a formula cuadrática
28±√(−28)²−4⋅(1⋅147)/2⋅1
x =14±7
x=21
x=7
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x edad de pedro
x+11 =(x-13)² /2
2(x+11)=(x-13)²
2x+22=(x-13)²
2x+22=x²-26x+169
x²-26x+169-2x-22=0
x²-28x+147=0
−b±√b²−4(ac)/2a formula cuadrática
28±√(−28)²−4⋅(1⋅147)/2⋅1
x =14±7
x=21
x=7