Question

evaluate each if the following using identities: (–3a+5b)²​

Answer 1

$\huge\mathtt\purple{Answer }$

$\rightarrow\sf{ {(-3a + 5b )}^{2}}$

$\sf\pink{ using\:the\: identity\:{(a+b)}^{2} = {a}^{2} + 2\times a\times b + {b}^{2}}$

$\rightarrow\sf{ {(-3a)}^{2} + 2\times (-3a)\times 5b + {(5b)}^{2} }$

$\rightarrow\sf{ 9{a}^{2} - 30ab + 25{b}^{2} }$