Which value for x makes the sentence true 5+4*=3 squared +x squared

I pretty sure that if you want to make 5+4=3^2+x2, you just have to find a way to make 3^2, 9. So the value of x would have to be 0, because 0*0 is still zero. So the question would become 5+4=9+0, which is true.

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2