1.

Answer this question part 4​

Answer»

ANSWER:

\mathsf{\huge{9 {x}^{2} + 25 {y}^{2} - 4 {z}^{2} + 30xy}}

Step-by-step EXPLANATION:

{(3x + 5 y)}^{2} - 4 {z}^{2} \\ \\ {(3x)}^{2} + {(5y)}^{2} + 2 \times 3x \times 5y - 4 {z}^{2} \\ \\ 9 {x}^{2} + 25 {y}^{2} + 30xy - 4 {z}^{2} \\ \\ \bf \: 9 {x}^{2} + 25 {y}^{2} - 4 {z}^{2} + 30xy


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