Question

please give correct answer don't spam please (╯_╰)​

Answer 1

$(a) \: \: \: {35}^{2} = ( {30 + 5)}^{2} \\ (x + y) {}^{2} = {x}^{2} + {y}^{2} + 2xy \\ ( {30 + 5)}^{2} = {(30)}^{2} + {(5)}^{2} + 2 \times 30 \times 5 \\ = 900 + 25 + 300 \\ = 1225$

$(b) \: \: 103 \times 97 = (100 + 3) \times (100 - 3) \\ (x + y)(x - y) = {x}^{2} - {y}^{2} \\ (100 + 3)(100 - 3) = {100}^{2} - {3}^{2} \\ = 10000 - 9 \\ = 9991$