Question

(y+5) × (y+5) = 144cm ²

Answer 1

Dessa forma:

$(y + 5) . (y+5) = 144 cm^{2} \\ (y + 5)^{2} = 144 cm^{2} \\ (y+5) = \sqrt{144 cm^{2} } \\ y + 5 = 12 \\ y = 12 - 5 \\ y = 7$