Question

toata rezolvarea urgent! dau coroana si multe puncte!!​

Answer 1

1)

${x}^{2} = 100 = > \sqrt{100 } = 10$

3)

$2 {x}^{2} = 72 = > {x}^{2} = 72 \div 2 = 36 = > x = \sqrt{36 } = > x = 6$

4)

$7 {x}^{2} - 2 = 61 = > 7 {x}^{2} = 61 + 2 = > 7 {x}^{2} = 63 = > {x}^{2} = 63 \div 7 = > {x}^{2} = 9 = > x = \sqrt{9} = > x = 3$

5)

$5 {x}^{2} - 3 = 17 = > 5 {x}^{2} = 17 + 3 = > 5 {x}^{2} = 20 = > {x}^{2} = 20 \div 5 = {x}^{2} = 4 = > x = \sqrt{4 } = > x = 2$

6)

$(x - 5) ^{2} = 9 = > x - 5 = \sqrt{9 } = > x - 5 = 3 = > x = 5 + 3 = > x = 8$

7)

$(x - 3) ^{2} = 25 = > x - 3= \sqrt{25} = > x - 3 = 5 = > x = 5 + 3 = > x = 8$

8)

$(x + 7) ^{2} = 81 = > x + 7 = \sqrt{81} = > x + 7 = 9 = > x = 9 - 7 = > x = 3$

9)

$3(x + 5) ^{2} = 27 = > (x + 5 ) {}^{2} = 27 \div 3 = > (x + 5) {}^{2} = 9 = > x + 5 = \sqrt{9} = > x + 5 = 3 = > x = 3 - 5 = > x = - 2$

10)

$2(x + 3) {}^{2} = 162 = > (x + 3) {}^{2} = 162 \div 2 = > (x + 3) {}^{2} = 81 = > x + 3 = \sqrt{81} = > x + 3 = 9 = > x = 9 - 3 = > x = 3$