Question

If x^2 = 7 , x^4 + y^2 = 50, and y + w = 3, which of the following is possible Value of W

Answer 1

Answer:

2 OR4 ; both correct

Explanation:

x^2=7

x^4+y^2=50

x^4=(x^2)^2=(7)^2=49 --> 49+y^2=50

y^2=50-49=1 --> y=±$\sqrt{1}$ --> y=±1

+1 or -1 both possible --> solve both

+1+w=3 --> w = 3 - 1 = 2

OR

-1+w=3 --> w = 3 + 1 = 4