Answer to this equation 5x^2+2=7

x= 1  and x= -1

Step-by-step explanation:

(subtract 2 from both sides)

(divide by 5 from both sides)

(take the square root from both sides)

x=±√1

so,

x= 1

and

x= -1

yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36