Question

7 and 9 pls solve and explain it step by step​

Answer 1

Answer:

Step-by-step explanation:

7.

x^2 = 7 + sqrt(1 + x)

x^2 - 7 = sqrt(1 + x)

(x^2 - 7)^2 = 1 + x

x^4 - 14x^2 + 49 = 1 + x

x^4 - 14x^2 - x = - 48.