Question

( 3a + 5b )^2 - 4c^2​

Answer 1

Answer:

${3a}^{2} + 2(3a \times 5b) + {5a}^{2} - {4c}^{2}$

$9 {a}^{2} + 2(15ab) + 25 {b}^{2} - {16c}^{2}$

$9 {a}^{2} + 30ab + 25 {b}^{2} - {16c}^{2}$

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