Solve each of the following by using the quadratic formula, rounding around to 3 decimal places.
a. 4x^2 - 2x - 3 = 0
b. 7x^2 + 4x - 1 = 0
c. -8x^2 - x + 2 = 0

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

definitely a. the others have almost all data points on one side of the line.

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -