Question

Please answer please

Answer 1

sorry I don't know but I will give the answer

Answer 2

Simple algebraic formulae are used.
Please refer the above photograph for the used process.
Formulae :
${(x + y)}^{2} = {x}^{2} + {y}^{2} + 2xy$
${(x - y)}^{2} = {x}^{2} + {y}^{2} - 2xy$
${(a + b + c)}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ca)$

Hope this will be helping you.

WARM REGARDS
Sahil khirwal