Identifying a, b, c coefficients in quadratics

Using the quadratic expression below, type the coefficient that represents a.

 $2x^2-9x+10=0$  

Using the quadratic expression below, type the coefficient that represents a.

 $7x^2-87x-20=0$  

Using the quadratic expression below, type the coefficient that represents b.

 $x^2-6x+4=0$  

Using the quadratic expression below, type the coefficient that represents b.

 $-5x^2+90x+8=0$  

Using the quadratic expression below, type the coefficient that represents c.

 $-4x^2-67x+12=0$  

Using the quadratic expression below, type the coefficient that represents c.

 $12x^2+34x-79=0$  

Using the quadratic expression below, type the coefficient that represents b.

 $x^2+7x-13=-3x$  

Using the quadratic expression below, type the coefficient that represents a.

 $2x^2-7x-13=-4x^2+12$