Question

plz explain step by by step and explain only maths expert plz
i need this answer correct ​

Answer 1

L.H.S

= (3x + 5y)2 – 30xy  

= (3x)2 + 2 × 3x × 5y + (5y)2 – 30xy

[Since (a + b)2 = a2 + 2ab + b2]

= 9x2 + 30xy + 25y2 – 30xy

= 9x2 + 25y2  = R.H.S

Answer 2

$\frac{2}{7} \times ( \frac{ - 3}{5} + \frac{4}{10} ) = \frac{2}{7} \times \frac{ - 3}{5} + \frac{2}{7} \times \frac{4}{10}$

$\frac{2}{7} \times ( \frac{ - 6 + 4}{10}) = \frac{ - 6}{35} + \frac{8}{70}$

$\frac{2}{7} \times - \frac{ - 2}{10} = \frac{ - 12 + 8}{70}$

$- \frac{4}{70} = - \frac{4}{70}$

$L.H.S = R.H.S$