Question

Please Tell the answer *****​

Answer 1

x^2-7=0

adding +7 on both sides

x^2-7+7=0+7

x^2=7

x=√7

Answer 2

Step-by-step explanation:

you have to apply the formula,

x= -b±√D/2a

now, compare x²-7 with ax²+bx+c

here, a= 1, b=0 and c = -7

So,

D = b²-4ac

=0- (4×1×-7)

= -(-28)

= 28

now,

x = -b±√D/2a

=0± √28/2×1

=±√28/2

=±2√7/2

=2√7/2 or -2√7/2

= √7 or -√7

so, x²-7 has two roots, √7 and -√7

I hope that it will be truly helpfull to you