Question

1. (7a-1)²
2. (2a+3)²
3. (x-y)²
4. (2a+3b)²
5.(10t + 20x)²
please answer this question for 8th
please ​

Answer 1

Answer:

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$1.(7a - 1) {}^{2} = ({7a})^{2} - 2 \times (7a) \times 1 + {1}^{2} \\ = 49 {a}^{2} - 14a + 1$

$2.(2a + 3) {}^{2} = {(2a)}^{2} + 2 \times 2a \times 3 + {3}^{2} \\ = 4a {}^{2} + 12a + 9$

$3.(x - y) {}^{2} = {x}^{2} - 2xy + {y}^{2}$

$4. {(2a + 3b)}^{2} = {(2a)}^{2} + 2 \times 2a \times 3b + {(3b)}^{2} \\ = 4 {a}^{2} + 12ab + 9 {b}^{2}$

$5. {(10t + 20x)}^{2} = {(10t)}^{2} + 2 \times 10t \times 20x + {(20x)}^{2} \\ = 100 {t}^{2} + 400tx + 400 {x}^{2}$

Step-by-step explanation:

Hope it will help you✌️

Answer 2

Answer:

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