Question

x(x-7)= -10
x2 = 2x +3

Answer 1

$x(x-7)= -10\\ x^{2}-7x+10=0\\\\a=1,\ b=-7,\ c=10$

Δ= b²-4.a.c
Δ= (-7)²-4.1.10
Δ= 9

x= (-b±√Δ)/2.a

x= (7±3)/2

x'= 10
x''= 2
________________________________________________
x²= 2x+3
x²-2x-3= 0

x= 1, b= -2, c= -3

Δ= (-2)²-4.1.(-3)
Δ= 16

x= (2±4)/2

x'= 3
x''= -1


Forte abraço!