Question

A 2.x+5^2=8.7+13^0

B 7.(x+4)=49

C (9.x-81):3=√4+5

AYUDA POR FAVOR (:
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Answer 1

Solución:

1)

$2x + {5}^{2} = 8 \times 7 + {13}^{0} \\ 2x + 25 = 56 + 1 \\ 2x + 25 = 57 \\ 2x = 57 - 25 \\ 2x = 32 \\ x = \frac{32}{2} \\ x = 16$

2)

$7(x + 4) = 49 \\ 7x + 28 = 49 \\ 7x = 49 - 28 \\ 7x = 21 \\ x = \frac{21}{7} \\ x = 3$

3)

$(9x - 81) \div 3 = \sqrt{4 + 5} \\ 3x - 27= \sqrt{9} \\ 3x - 27 = 3 \\ 3x = 3 + 27 \\ 3x = 30 \\ x = \frac{30}{3} \\ x = 10$