Question

What is the value of x in the equation 25x = 16?

O A + 4
5
OB.
+4
oc. + 1
OD
NIH
clos
Reset

Answer 1

C. ±4/5

Explanation:

25x² = 16

25x² - 16 = 16 - 16

25x² - 16 = 0

25x² + 20x - 20x - 16 = 0

(25x² + 20x) + (- 20x - 16) = 0

5x(5x + 4) - 4(5x + 4) = 0

(5x - 4)(5x + 4) = 0

5x - 4 =0

5x + 4 = 0

`x=-(4)/(5)`

`x=(4)/(5)`

± is a symbol which represents addition and subtraction.