Question

Expand the number (3a+5b)²​

Answer 1

Answer:

Answer

Step-by-step explanation:

here we use identity

(a+b)^2

a^2+2ab+b^2

Answer 2

$(3a - 5b) {}^{2} \\ \\ = > {3a}^{2} + 5b {}^{2} + 2 \times (3a) \times ( - 5b) \\ \\ = > {9a}^{2} + {25b}^{2} + 30ab$