Question

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Answer 1

2.

$\frac{66}{5} \times \frac{10}{11} - \frac{35}{2} \times \frac{3}{5} - \frac{12}{5} \times ( - \frac{55}{12}) - \frac{23}{4}$

$12 - \frac{21}{2} + 11 - \frac{23}{4}$

$\frac{12}{1} - \frac{21}{2} = \frac{24 - 21}{2} = \frac{3}{2}$

$\frac{11}{1} - \frac{23}{4} = \frac{44 - 23}{4} = \frac{21}{4}$

$\frac{3}{2} + \frac{21}{4} = \frac{6 + 21}{4} = \frac{27}{4}ili 6 \frac{3}{4}$

3.

$a) {y}^{2} - 6y + 2y - 12 = y(y - 6) + 2(y - 6) = (y + 2) {(y - 6)}^{2}$

$b) {5m}^{2} - {5n}^{2} = 5( {m}^{2} - {n}^{2}) = 5(m - n)(m + n)$

$b) {36a}^{2} - 36ab + {9b}^{2} = 9( {4a}^{2} - ab - {b}^{2})$

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