Question

answer this question part 4​

Answer 1

Answer:

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

Step-by-step explanation:

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

Answer 2

Your answer⬇️

${9x}^{2} + {25y}^{2} - {4z }^{2} + 30xy$

Explanation

${(3x )}^{2} + {(5y)}^{2} - {4z}^{2}$

${(3x)}^{2} + {(5y)}^{2} + 2 \times 3x \times 5y - {4z}^{2}$

${9x}^{2} + {25y}^{2} + 36 \times y - {4z}^{2}$

${9x}^{2} + {25y}^{2} - 4z + 30xy$

I hope this will help you