Question

4,5,6 este urgent dau coroană

Answer 1

4)

a) 5 x + 7 = 52

5 x = 52 - 7

5 x = 45

x = 45 : 5

x = 9

b)

16 = 2 x - 8

2 x - 8 = 16

2 x = 16 + 8

2 x = 24

x = 24 : 2

x = 12

V: 2 × 12 - 8 = 24 - 8 = 16

5)

3 y = 27 ⇒ y = 27 : 3 ⇒ y = 9 ⇒ y = 3²

y² = 9² = 9 × 9 = 81

6)

9¹⁵ si 27¹¹

9¹⁵ = ( 3²)¹⁵ = 3²ˣ¹⁵ = 3³⁰

27¹¹ = ( 3³ )¹¹ = 3³ ˣ ¹¹ = 3³³

3³⁰ < 3³³

9¹⁵ < 27¹¹

Answer 2

$4) \\ \\ 5x + 7 = 52 \\ \\ 5x = 52 - 7 = 45 \\ \\ \frac{5x}{5} = \frac{45}{5} \\ \\ x = 9 \\ \\ 16 = 2x - 8 \\ \\ 2x - 8 = 16 \\ \\ 2x = 8 + 16 = 24 \\ \\ \frac{2x}{2} = \frac{24}{2} \\ \\ x = 12 \\ \\ 5) \\ \\ {3}^{y} = {3}^{3} \\ \\ y = 3 \\ \\ {3}^{2} = 9 \\ \\ {y}^{2} = {9}^{2} = 9 \times 9 = 81$