Question

use a suitable identity to expand (3x +10y ) ²

Answer 1

Answer:

a+b whole square

Step-by-step explanation:

a square plus b square plus 2ab

Answer 2

$(3x + 10y) {}^{2} \\ \\ = > 3x {}^{2} + {10y}^{2} + 2 \times (3x)(10y) \\ \\ = > 9x {}^{2} + {100y}^{2} + 60xy$