Question

expand using identities (3x-5z)^2​

Answer 1

Answer:

(3x-5z)^2

=(3x)^2 + (5z)^2 - 2(3x)(5z)

= 9x^2 + 25z^2 - 30xz

Answer 2

$\tt \huge \bigstar \: \: {(3x - 5z)}^{2} \\ \\ \bf \longrightarrow \: {(3x)}^{2} + {(5z)}^{2} - 2(3x)(5z) \\ \bf \longrightarrow \: \red{{9x}^{2} + {25z}^{2} - 30xz}$

● Useful Identities :-

• $\small \rm (a + b)(a - b) = {a}^{2} - {b}^{2}$
• $\small \rm ( a + x)(a + y) = {a}^{2} + (x + y)a + xy$
• $\rm \tiny {(a + b + c)}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ca)$