Question

Poderiam resolver isso pra mim?

A) x² - 90 = 31

B) 5x² + 4 = 49

C) 4x² - 27 = x²

D) 2x² + 11 = x²+12

E) 5 (x²-1) = 4 (x²+1)

F) x (x+2) = 2x+25

Answer 1

A ) x² = 31 + 90
x²= 121
x=√121
x= 11

B) 5x²= 49 - 4
5x²= 45
x²= 45/5
x²= 9
x=√9
x=3

C) 4x²-x²= 27
3x²=27
x²= 27/3
x²= 9
x= √9
x=3

D) 2x²-x² = 12 -11
x²=1
x=√1
x=1

E) 5x² -5 = 4x²+4
5x²-4x²= 4+5
x²= 9
x=√9
x=3

F) x²+2x= 2x+25
x²+2x-2x = 25
x²= 25
x=√25
x=5