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y su base es 2 cm
área del rectángulo=B•h
=2•7
=14
base=x-5
area=x(x-5)
14=x^2-5x
x^2-5x-14=0
x=-(-5)+-raiz(-5^2-4(1)(-14))÷2(1)
x=7
x=-2
pero x tienes q ser positivo entonces x=7
rptax=7