Question

use suttible identity solve:(2y+5)(2y+5)​

Answer 1

Answer:

$(2y + 5)(2y + 5) = (2y + 5) {}^{2} \\ = {(2y)}^{2} + {(5)}^{2} + 2 \times 2y \times 5 \\ = 4 {y}^{2} + 25 + 20y \\ = 4 {y}^{2} + 20y + 25$