X^2-10x=-21

It is a quadratic equation with variable x.

x2 - 10x = -21

adding 21 on both sides

x2 - 10x + 21 = -21 + 21

x2 - 10x + 21 = 0

x2 - 7x - 3x + 21 0

x(x - 7) - 3(x - 7) = 0

(x - 3)(x - 7) = 0

x-3 = 0; x - 7 =0

x = 3, 7

So, the values of x are 3 and .

It is a quadratic equation with variable x.

x2 - 10x = -21

adding 21 on both sides

x2 - 10x + 21 = -21 + 21

x2 - 10x + 21 = 0

x2 - 7x - 3x + 21 0

x(x - 7) - 3(x - 7) = 0

(x - 3)(x - 7) = 0

x-3 = 0; x - 7 =0

x = 3, 7

So, the values of x are 3 and .